Outlook is losing connections with my gmail accounts

The error 0x800CCC0E with Gmail accounts in classic Outlook is a known issue related to how Outlook connects to Google (IMAP and Google’s permissions).

Use these steps in order:

1. Confirm Outlook is on a fixed build
   The issue with adding/syncing Gmail in classic Outlook has been fixed in newer builds. Make sure Outlook is updated to a build that includes the Gmail fixes:
   • For the sign‑in/add‑account issue: Current Channel Version 2404 (Build 17531.10000) or later.
   • For the IMAP permission issue: Current Channel Version 2412 (Build 18324.20168) or later.
     In Outlook, go to File > Office Account > Update Options > Update Now and let Office update.
2. Re‑run the Gmail browser consent with full permissions
   When adding a Gmail account, Outlook opens a Google sign‑in page. If the checkbox granting full mail access was not selected, Outlook cannot sync folders and can show 0x800CCC0E.
   On a fixed build (Version 2412 Build 18324.20168 or later):
   • Start Outlook and let it try to sync the Gmail account.
   • When the error dialog appears, select the Retry link.
   • In the browser window that opens, sign in to the affected Gmail account.
   • On the consent screen, ensure the box is checked for:
     “Read, compose, send, and permanently delete all your email from Gmail.”
   • Complete the sign‑in and return to Outlook, then test Send/Receive.
3. If Retry does not work, remove and re‑add the account after fixing Gmail settings a. Enable IMAP in Gmail (per account):
   • In a browser, sign in to Gmail for each affected account.
   • Go to Settings (gear) > See all settings > Forwarding and POP/IMAP.
   • Under IMAP access, select Enable IMAP.
   • Select Save Changes.
   b. Re‑add the Gmail account in Outlook:
   • Close Outlook.
   • Open Control Panel > Mail > Email Accounts….
   • Remove any broken instance of the affected Gmail account.
   • Select New, enter name, full Gmail address, and password, then Next.
   • When the Google sign‑in window appears, sign in and again ensure the permission “Read, compose, send, and permanently delete all your email from Gmail.” is selected.
   • Finish setup and then restart Outlook.
4. Check IMAP security options if Outlook never prompts for password
   If Outlook is not prompting for a password or fails immediately:
   • In the account’s IMAP settings in Outlook, make sure Require logon using Secure Password Authentication (SPA) is unchecked.
   • If still failing, use Control Panel > Mail > Email Accounts… > New and let automatic setup run as described above.
5. Verify Gmail server settings (if using manual setup)
   For any manually configured Gmail IMAP account, confirm the standard settings:
   • Incoming (IMAP): imap.gmail.com, SSL required, port 993.
   • Outgoing (SMTP): smtp.gmail.com, SSL or TLS required, authentication required, port 465 (SSL) or 587 (TLS/STARTTLS).
   • Username: full Gmail address.
   • Password: the correct Gmail password (or app password if using that model).

After completing these steps for each affected Gmail account, Outlook should be able to connect and synchronize subscribed folders without the 0x800CCC0E error.

References:

• Unable to add a Gmail account to classic Outlook
• Unable to sign in or add a Gmail account to classic Outlook
• Troubleshoot Outlook email setup
• Fix problems connecting your Google account to the Microsoft Cloud