MS 365 Outlook not working gmail

Question

MS 365 Outlook not working Gmail all of a sudden. Fine for years then all of a sudden no longer

Answer 1

Hello,

The AI answer is good, but missing some steps, specifically step 6 in the workaround instruced below: https://support.microsoft.com/office/users-get-errors-0x800ccc0e-0x800ccc0f-synchronizing-gmail-and-yahoo-accounts-in-classic-outlook-e5a7b684-7c5c-4848-ab2d-d48291451f67

Answer 2

Gmail accounts stopping suddenly in classic Outlook are typically caused by recent changes in Google authentication or Outlook builds.

Use these checks and fixes:

1. Confirm Outlook build has the Gmail fix
   • In Outlook, go to File > Office Account > About Outlook and verify the version/channel.
   • For classic Outlook Gmail sign‑in issues, fixes are available starting with:
     • Current Channel: Version 2404 (Build 17531.10000) and later for the “browser or app may not be secure” / IMAP setup errors.
     • Current Channel Version 2412 Build 18324.20168 for the “Retry” Gmail consent fix.
   • If on an older build, update Outlook via File > Office Account > Update Options > Update Now.
2. Re‑do Google consent for Microsoft apps If Outlook shows errors like:
   • “We couldn’t log on to the incoming (POP/IMAP) server…”
   • “We weren’t able to set up your Google account with IMAP…”
   • or Send/Receive error 0x800CCC0E for Gmail Then the Gmail consent for Microsoft apps may be incomplete.
   On a build that includes the fix (Current Channel Version 2412 Build 18324.20168 or later):
   • Trigger Send/Receive or account setup so the error window appears.
   • Select the Retry link in the error dialog.
   • In the browser sign‑in to Google, make sure to check the box:
     • “Read, compose, send, and permanently delete all your email from Gmail.” under Select what Microsoft apps & services can access.
   • Complete sign‑in and return to Outlook, then test Send/Receive.
3. Ensure IMAP is enabled in Gmail If the error mentions IMAP or “You may need to make changes to your Gmail settings,” IMAP may be disabled:
   • In a browser, sign in to Gmail.
   • Go to Settings > See all settings > Forwarding and POP/IMAP.
   • Under IMAP access, select Enable IMAP.
   • Select Save Changes.
   • Retry Send/Receive in Outlook.
4. Fix “Could not sign you in to Google – IMAP” when adding Gmail If adding the Gmail account shows:
   • “Sorry, we could not sign you in to Google – IMAP. Please try again later.” And Outlook is on a version earlier than 2008 Build 13127.20296, enable optional connected experiences as a workaround:
   • Open Outlook (or any Office app).
   • Go to File > Office Account > Account Privacy > Manage Settings.
   • Check Enable optional connected experiences.
   • Restart Outlook and add the Gmail account again.
5. If Outlook says “The browser or app may not be secure”
   • Make sure Outlook is on a channel/build that contains the fix (e.g., Current Channel Version 2404 Build 17531.10000 or later).
   • The fix changes sign‑in to open another browser window; after updating, retry adding or syncing the Gmail account.

If multiple Gmail accounts stopped at the same time, focus on steps 1–3: update Outlook to a fixed build, re‑run the Google consent with the correct permission box checked, and verify IMAP is enabled in Gmail.

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References:

• Unable to add a Gmail account to classic Outlook
• Unable to add a Gmail account to Outlook "Could not sign you in to Google"
• Unable to sign in or add a Gmail account to classic Outlook
• Fix problems connecting your Google account to the Microsoft Cloud