stop continual popups asking for credentials

David Andreae 20 Reputation points
2026-01-23T19:15:29.81+00:00

I have 3 comcast email accounts set up in Microsoft Outlook 365. Today, I've been getting continual popups asking for the credentials for each of those accounts. How do I stop these popups? I recently disconnected my comcast account, but can continue to access email on the comcast website, so why does Outlook keep asking for updated email addresses and passwords?

Outlook | Windows | Classic Outlook for Windows | For business
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Answer accepted by question author
Anonymous
2026-01-24T09:31:17.0066667+00:00

Hi David Andreae

Thank you for reaching out via the Microsoft Q&A forum.

Since you are able to log in via the web, I understand your password is correct. However, Outlook and your web browser connect to the server differently. When you recently disconnected your Comcast service, the security policies for your email accounts likely defaulted to a stricter setting. Currently, the Comcast server may block "Third-Party Programs" (like Outlook) from connecting. Outlook interprets this rejection as an incorrect password, which causes the popup loop.

Here some recommended solutions you can try:

Clear Cached Credentials to ensure Windows isn't holding onto an old, invalid connection token.

  • Close Outlook completely > Click the Start button, type Credential Manager, and open it.
  • Click on Windows Credentials > Scroll down to Generic Credentials and look for any entries referencing your Comcast email addresses or MicrosoftOffice15_Data:SSPI (or MicrosoftOffice16_Data:SSPI)
  • Click the arrow to expand them and select Remove > Restart Outlook.

Authorize Outlook (Comcast Website)

In Comcast server, you must allow Outlook to access your mail again. For your detailed information, you can see: Turn your access to third-party email programs on or off in Xfinity Email - Xfinity Support

(Note: Microsoft is providing this information as a convenience to you. These sites are not controlled by Microsoft, and Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please ensure that you fully understand the risks before using any suggestions from the above link)

Once you have enabled the setting, please open Outlook. It may ask for your password one last time; enter it and check "Save this password".

I hope this information is helpful.

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  1. AI answer

    2026-01-23T19:30:14.8533333+00:00

    To address the issue of Microsoft Outlook 365 continually prompting you for credentials for your Comcast email accounts, you can follow these steps:

    1. Clear Cached Credentials:
      • Go to Control Panel and open Credential Manager.
      • Under Windows Credentials, find and remove any entries related to Outlook or Microsoft Office.
      • Restart Outlook and enter your credentials again when prompted.
    2. Adjust Logon Network Security Setting:
      • Exit Outlook and access Control Panel.
      • Click on Mail, then select Show Profiles.
      • Choose your Outlook profile and click Properties.
      • Click on E-mail Accounts, select your email account, and click Change.
      • In the Change Account dialog, click More Settings and navigate to the Security tab.
      • Set the Logon network security option to Anonymous Authentication.
      • Confirm the changes and close the dialog boxes.
    3. Check for Modern Authentication:
      • If the problem continues, consult with your IT team to determine if there are any domain or policy restrictions affecting authentication.

    By following these steps, you should be able to stop the credential prompts in Outlook for your Comcast accounts.

    References:

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