Error 0x800CCC0E Gmail Outlook Fix

| March 10, 2026

Error 0x800CCC0E Gmail Outlook Fix

I’m going to save someone time here, I did not figure this fix out myself but found it in another Microsoft post. https://support.microsoft.com/en-us/office/unable-to-add-a-gmail-account-to-classic-outlook-4d9530c5-3f40-4e6d-9b45-4477f160828f

Client called with issues connecting, and his apps were connected but most likely not working anymore. These instructions helped.

Step 1: Remove access for Microsoft Apps & Services in Gmail.

  1. Close Outlook.
  2. Sign in to your Google account on google.com.
  3. Select your profile picture in the top corner and select Manage your Google Account.
  4. On the left side menu, select Security.
  5. Scroll down to Your connections to third-party apps & services and select Microsoft apps & services.
  6. Locate Microsoft apps & services has some access to your Google Account and select See Details.
  7. Under Access you’ve given to Microsoft apps & services, select Remove all access.
  8. Select Confirm.

Step 2: Delete the Google IMAP credentials from Windows Credential Manager

  1. From the Windows Start menu, search for Credential Manager and open it. On Windows 10 you may need to open the Control Panel to access Credential Manager. For more information, please go to Accessing Credential Manager.
  2. Under Manage your credentials, select Windows Credentials.
  3. Scroll down to Generic credentials and locate those starting with MicrosoftOffice16_Data:OAUTH2.
  4. Expand each of these and hover over MicrosoftOffice16_Data:OAUTH2 until it shows the full name including the tp_google_imap_Oauth2. These are the Google credentials for your Gmail account.
  5. Select Remove for each of these with the MicrosoftOffice16_Data:OAUTH2. There are two of these credentials for each Gmail account so make sure you remove both.

After you have done the steps above you are now ready to Sign in via browser from Outlook. Open Outlook to the Outlook profile that was not syncing and select the Sign in via browser business bar in Outlook. Make sure during browser sign in to check the box for Microsoft apps & services noted at the top of this article.

If you removed the Gmail account from your Outlook profile, select File, Add account to add the Gmail account back again and do the browser sign in process again.

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Category: Outlook Support

About the Author ()

Lisa Hendrickson is the owner of Call That Girl. She is an Outlook Expert and Microsoft 365 Consultant.

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