Cannot join/ see Office 365 Groups in Outlook 365

This might be happen either if an Azure AD Account is corrupted or it was incorrectly migrated during Azure AD Sync.

If the user can access or see the Unified Group, you have to manually remove and re-add the account to the group.

The error message, if a user try to add/ join the group is:
Your request could not be sent. Please try again later.


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