My yahoo email is now in accessible via outlook

Question

My yahoo email is now in accessible via outlook

JollyNanda-0364 5

Using classic version. Had yahoo mail working on it perfectly.. last couple of days started having issues where it started hanging up.. not syncing. I tried to reset it, didnt work. I tried to delete the account and readd it. Now I cannot readd it. Error Msg = Something went wrong and outlook couldn't setup your account. Please try again. If the problem continues, contact your email administrator.

Ken Wolf 5 Reputation points

2026-03-07T13:05:03.8833333+00:00

I have the same problem -- the dialog for OAuth simply never appears when trying to re-add Yahoo mail to Classic Outlook.

This is after removing the account that failed to sync.

Thunderbird email client works perfectly so I think something's busted with Outlook Classic.
Victor1-V 8,745 Reputation points Microsoft External Staff Moderator

2026-03-07T14:43:34.4566667+00:00

Hi Ken Wolf,

Thanks for sharing the details.

When the Yahoo OAuth sign‑in window does not appear in Classic Outlook after the account is removed, it usually means Outlook is still relying on cached credentials or a previous sign‑in path instead of triggering the browser‑based authentication again. This can happen even if the account itself was deleted from Outlook.

Since the account works correctly in another mail client, that helps confirm the mailbox and credentials are valid. In Outlook Classic, clearing any Yahoo‑ or Outlook‑related entries from Windows Credential Manager and then re‑adding the account is often necessary to force the correct sign‑in flow (OAuth or app password, depending on the build).

If Outlook still never presents the Yahoo sign‑in window after that, this forum does not have access to authentication logs, and further investigation would be required outside the forum.

If you can share whether Outlook shows any password prompt at all during setup, that would help narrow down the next step.
Ken Wolf 5 Reputation points

2026-03-07T14:56:43.79+00:00

I checked the credential manager and it shows no saved passwords for anything "yahoo" in either the "Web Credentials" category nor the "Windows Credentials" category. Edge has a saved password and has been "authorized."

FYI, another computer remains configured as it used to be though it refuses to sync or send new mail. Both were working fine until a few days ago.

Sounds like "outside the forum" is the unfortunate answer.

No password dialog of any sort appears.

There are three "MicrosoftOffice16_Data:" OAUTH2 credentials listed under "Generic Credentials" but the details show nothing Yahoo-related.
Victor1-V 8,745 Reputation points Microsoft External Staff Moderator

2026-03-08T09:41:28.5766667+00:00
Hi Ken Wolf,

From what you described, Classic Outlook is currently not presenting any sign-in experience for Yahoo (no browser-based OAuth window and no password prompt), even after you confirmed there are no Yahoo entries saved in Credential Manager.

A couple of points to keep the next steps grounded:

1, Force the non‑OAuth path using a Yahoo app password

Even if OAuth is supported in the Outlook build, Yahoo may still require an app password when OAuth does not initialize correctly. One practical test is to generate a Yahoo app password and manually add the account using the IMAP/SMTP option, entering the app password when prompted. This bypasses the OAuth trigger entirely and helps determine whether Outlook can authenticate at all when OAuth is removed from the equation. Reference: https://help.yahoo.com/kb/SLN15241.html

Disclaimer: This is a non‑Microsoft website. Please review the content carefully and avoid ads or unrelated downloads.

2, Test with a fresh Windows user profile

Since the behavior persists even after clearing credentials, the sign‑in state Outlook relies on may be tied to the Windows user profile rather than Credential Manager alone. Creating a new local Windows user profile and testing Outlook there (without signing into Edge first) is one of the few remaining ways to rule out profile‑level sign‑in corruption. This does not require changing the existing profile and can be reversed easily if the test does not help.

3, Validate behavior in New Outlook for Windows (comparison only)

If available, adding the same Yahoo account to the New Outlook for Windows can be useful as a comparison test. This does not replace Classic Outlook, but it helps confirm whether the issue is isolated to the Classic Outlook authentication pipeline on the affected systems.

Given that Outlook is neither presenting OAuth nor a password prompt, and the account works elsewhere, this does reach the boundary of what can be investigated from a public forum. Contributors here do not have visibility into Outlook’s internal authentication state or Yahoo’s OAuth handoff logs.

If none of the options above change the behavior, the most effective next step would be to contact Microsoft Support directly for further investigation. Please follow below steps to contact a live chat support:

Visit the Microsoft Support contact page: Contact - Microsoft Support

In the search bar provided on the page, type "Outlook issue" and press Enter.

Click on the "Get Help" button that appears.

Scroll down the page until you see and click on the "Contact Support" option.

When prompted to select your product or service, choose "Other Products".

For the category, choose "Outlook".

Look for and click on "Chat with a support agent in your web browser".

Confirm your personal email when prompted - this is the email Microsoft will use to communicate with you during and after the support session.

Explain your situation clearly: Be concise but provide all the relevant details.

I hope this helps clarify where the limitation is and gives you a couple of remaining angles to test.
Ken Wolf 5 Reputation points

2026-03-08T10:03:00.9833333+00:00

Thanks, Victor1-V. Very helpful suggestions.

I created a new Windows local account profile and launched Classic Outlook with a five-day, no-sign-in trial and gave it my Yahoo address when prompted. It initially retuned the same error as the O.P. noted at the start of the thread, but I chose the "Change account settings" option, ticked the checkboxes to require SPA for both IMAP and SMTP connections, and it opened the OAUTH windows properly.

I have tried that same option previously under the normal Windows account profile, but it returns the previously noted error.

I've also tried just a new Outlook profile but that errors out too.

I think you're certainly correct about Windows saving the incorrect credentials somewhere.

I can look at what gets created in the credential manager for under the new Windows account profile and compare it to the original. I'll write the results.

EDIT: Deleting all the OAUTH entries in the credential manager did the trick though I have to tell Outlook Classic to require SPA.

Great help. Thanks!
Victor1-V 8,745 Reputation points Microsoft External Staff Moderator

2026-03-11T13:33:31.9633333+00:00

Hi Ken Wolf,

Thank you for the update - that’s very helpful.

What you observed is consistent with a corrupted OAuth sign‑in state tied to the original Windows user profile. The fact that Classic Outlook triggered the Yahoo OAuth window under a new Windows profile, and then worked again after removing the OAuth‑related entries from Credential Manager and forcing SPA, strongly suggests Outlook was relying on an invalid cached authentication state instead of prompting for a fresh sign‑in.

This also explains why creating only a new Outlook profile did not resolve the issue, and why the account continued to work normally in other mail clients.

I’m glad the steps helped restore access in Classic Outlook, and the additional detail you shared should be useful context for others who encounter the same behavior.

1 answer

Your answer

Ken Wolf 5 Reputation points

2026-03-07T13:05:03.8833333+00:00

I have the same problem -- the dialog for OAuth simply never appears when trying to re-add Yahoo mail to Classic Outlook.

This is after removing the account that failed to sync.

Thunderbird email client works perfectly so I think something's busted with Outlook Classic.
Victor1-V 8,745 Reputation points Microsoft External Staff Moderator

2026-03-07T14:43:34.4566667+00:00

Hi Ken Wolf,

Thanks for sharing the details.

When the Yahoo OAuth sign‑in window does not appear in Classic Outlook after the account is removed, it usually means Outlook is still relying on cached credentials or a previous sign‑in path instead of triggering the browser‑based authentication again. This can happen even if the account itself was deleted from Outlook.

Since the account works correctly in another mail client, that helps confirm the mailbox and credentials are valid. In Outlook Classic, clearing any Yahoo‑ or Outlook‑related entries from Windows Credential Manager and then re‑adding the account is often necessary to force the correct sign‑in flow (OAuth or app password, depending on the build).

If Outlook still never presents the Yahoo sign‑in window after that, this forum does not have access to authentication logs, and further investigation would be required outside the forum.

If you can share whether Outlook shows any password prompt at all during setup, that would help narrow down the next step.
Ken Wolf 5 Reputation points

2026-03-07T14:56:43.79+00:00

I checked the credential manager and it shows no saved passwords for anything "yahoo" in either the "Web Credentials" category nor the "Windows Credentials" category. Edge has a saved password and has been "authorized."

FYI, another computer remains configured as it used to be though it refuses to sync or send new mail. Both were working fine until a few days ago.

Sounds like "outside the forum" is the unfortunate answer.

No password dialog of any sort appears.

There are three "MicrosoftOffice16_Data:" OAUTH2 credentials listed under "Generic Credentials" but the details show nothing Yahoo-related.
Ken Wolf 5 Reputation points

2026-03-08T10:03:00.9833333+00:00

Thanks, Victor1-V. Very helpful suggestions.

I created a new Windows local account profile and launched Classic Outlook with a five-day, no-sign-in trial and gave it my Yahoo address when prompted. It initially retuned the same error as the O.P. noted at the start of the thread, but I chose the "Change account settings" option, ticked the checkboxes to require SPA for both IMAP and SMTP connections, and it opened the OAUTH windows properly.

I have tried that same option previously under the normal Windows account profile, but it returns the previously noted error.

I've also tried just a new Outlook profile but that errors out too.

I think you're certainly correct about Windows saving the incorrect credentials somewhere.

I can look at what gets created in the credential manager for under the new Windows account profile and compare it to the original. I'll write the results.

EDIT: Deleting all the OAUTH entries in the credential manager did the trick though I have to tell Outlook Classic to require SPA.

Great help. Thanks!
Victor1-V 8,745 Reputation points Microsoft External Staff Moderator

2026-03-11T13:33:31.9633333+00:00

Hi Ken Wolf,

Thank you for the update - that’s very helpful.

What you observed is consistent with a corrupted OAuth sign‑in state tied to the original Windows user profile. The fact that Classic Outlook triggered the Yahoo OAuth window under a new Windows profile, and then worked again after removing the OAuth‑related entries from Credential Manager and forcing SPA, strongly suggests Outlook was relying on an invalid cached authentication state instead of prompting for a fresh sign‑in.

This also explains why creating only a new Outlook profile did not resolve the issue, and why the account continued to work normally in other mail clients.

I’m glad the steps helped restore access in Classic Outlook, and the additional detail you shared should be useful context for others who encounter the same behavior.

Answer 1

Hi Jolly Nanda,

Welcome to the Microsoft Q&A forum.

I understand how frustrating this is, especially since the Yahoo account worked in Classic Outlook and then suddenly stopped syncing. Based on your description, the common cause is an authentication mismatch between Outlook and Yahoo (sign-in method or saved credentials), so the goal is to confirm the mailbox is accessible, then refresh the sign-in path Outlook uses.

You can try the following steps, in order:

1, Use Yahoo webmail as a quick comparison

Before changing anything else, sign in to Yahoo Mail in a browser to confirm the mailbox itself is accessible and receiving mail. If Outlook is currently unusable, using webmail is also the recommended workaround in some Outlook hanging scenarios until the local client is stable again.

Microsoft’s advisory explicitly lists “Use webmail” as a workaround while Outlook is hanging: Classic Outlook profiles with POP accounts and PSTs hang after Windows updates on January 13, 2026

2, Use the correct Yahoo sign-in method in Outlook (OAuth or App Password)

Depending on your Outlook build/version, Yahoo may be added using a browser-based Yahoo sign-in (OAuth), which does not require an app password. Microsoft has published details that Outlook Desktop added OAuth support for Yahoo IMAP accounts in specific Microsoft 365 Apps builds and channels. Reference: How to add a Yahoo IMAP account to Outlook Desktop without an App Password - Microsoft Support

If Outlook is not offering the Yahoo browser sign-in flow and is instead prompting for a password for IMAP/SMTP, Yahoo’s guidance is that third-party email apps may require an app password. In that case, generate a Yahoo app password and use it in Outlook instead of the normal Yahoo password. Reference: https://help.yahoo.com/kb/SLN15241.html

Disclaimer: This is a non-Microsoft website. Please review the content carefully and avoid any advertisements or unrelated downloads.

3, Clear any saved Outlook credentials in Windows

If the account was previously working and was removed and re-added, Outlook may still be using stored credentials. Close Outlook, open Windows Credential Manager, and remove saved credentials related to Outlook so Outlook can prompt again with the correct sign-in method.

Disclaimer: This step removes saved sign-in entries on the local device. After removing them, Outlook may prompt you to sign in again, and other Office apps that share saved credentials may also prompt once. Only remove entries clearly related to Outlook or Microsoft Office and avoid removing items that appear unrelated to mail or Office sign-in.

4, Remove and add the Yahoo account again

After clearing saved credentials, add the Yahoo account back in Outlook. Microsoft’s Yahoo setup article provides version-specific steps for adding and managing a Yahoo account in Outlook: Add or manage a Yahoo! email account in Outlook - Microsoft Support

If you need to verify the server settings during setup, Yahoo publishes the official IMAP/SMTP server names, ports, and SSL requirements (and notes that authentication is required): https://help.yahoo.com/kb/SLN4075.html

Disclaimer: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it. Microsoft provides no assurances and/or warranties, implied or otherwise, and is not responsible for the information you receive from the third-party linked sites or any support related to technology.

Just to set expectations clearly, this forum is a public, user-to-user space and contributors here do not have access to Yahoo’s account systems. If the mailbox works on Yahoo webmail but still cannot authenticate in Outlook after the steps above, it may require Yahoo-side assistance for account security or external app access.

If you can share whether Outlook is showing a Yahoo browser sign-in window (OAuth) or only a basic password prompt, I can help you align the next steps to the sign-in method you are seeing.

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

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Victor1-V 8,745 Reputation points Microsoft External Staff Moderator

2026-03-08T09:41:51.1966667+00:00

Hi Jolly Nanda,

I am following up to check whether you have had an opportunity to review the response provided and try the suggested steps.

Please feel free let me know if you need any further assistance. I remain available to assist you further.
Gabe Bratton 836 Reputation points Microsoft Employee Moderator

2026-03-11T20:33:01.6766667+00:00

There is a current Known Issue with Gmail and Yahoo accounts. Clearing credentials is a good workaround. There is another workaround in the Known Issue article, https://support.microsoft.com/en-us/office/users-get-errors-0x800ccc0e-0x800ccc0f-synchronizing-gmail-and-yahoo-accounts-in-classic-outlook-e5a7b684-7c5c-4848-ab2d-d48291451f67.

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My yahoo email is now in accessible via outlook

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