Error: "401 - Unauthorized: Access is denied due to invalid credentials" in Microsoft 365


Symptoms

You may receive the following message on Microsoft 365:

Server Error

401 - Unauthorized: Access is denied due to invalid credentials.

You do not have permission to view this directory or page using the credentials that you supplied.

Microsoft 365 pop-up server error message

Cause

Unknown

Resolution

Contact IT Help Central for assistance.