Microsoft Outlook get errors to synchronizeing Gmail (Classic Outlook)

Microsoft Outlook get errors to synchronizeing Gmail (Classic Outlook)
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Some user report that their outlook suddenly block from receiving email. When force send&receive show error (0x800CCC0E). This user using the company gmail account (IMAP) on the Microsoft Outlook (Apps for Business Package).


Error look like this.


Microsoft Outlook Version.


To fix this try the following steps:

Remove the MicrosoftOffice16_Data:OAUTH2 on the Credential manager

1. Open "Credential Manager"

  1. Delete the credential (In-case the computer have only 1 gmail account, delete the credentail should solve the problem).


3. After remove the credentail re-open the outlook. It will request to authentication login and allow to access outlook to gmail by browser popup to request to re-login and allow the permission.

  1. When allow complete outlook should syncronizing normally.



Delete the Identities registry key

1. Start > Run > "regedit".


2. Brows to..

Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity\Identities

  1. In "Identities" find the folder related to your email.

  1. Delete the folder under "Identities key", Select sub folder key matched with your email address that not syncing.
  2. After remove the credentail re-open the outlook. It will request to authentication login and allow to access outlook to gmail by browser popup to request to re-login and allow the permission.
  1. When allow complete outlook should syncronizing normally.

Noted:


1. Trying by change from classic outlook to new outlook this problem will solved.

2. Trying by re-setup gmail account (Control Panel > Mail > New Profile) with POP 3 setting + password using from app password (https://myaccount.google.com/apppasswords), It working.

  1. This issue founded with only some user in company.


Ref: 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