I have tried numerous times to enable my mailbox without any success. Here is the synchronization method: Incoming Email: Server-side synchronization or Email router Outgoing Email: Server-side synchronization or Email router Appointments, Contacts and Tasks: Server-side synchronization Whenever I try to approve mailbox then test it and enable it, I get the following error: " mail cannot be received for the mailbox [ My Mailbox]. Make sure that the credentials specified in the mailbox are correct and have sufficient permissions for receiving email. Then, enable the mailbox for email processing. Email Server Error Code: Http server returned 401 Unauthorized exception" My email address is exactly the same as the one I log into CRM with : *@*.onmicrosoft.com. And for "Allow to Use Credentials for Email Processing", I chose No. Any idea why I am getting this error?. What is the solution? P.S. I have read and tried so many microsoft pages on this error without any success
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