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Changing the property LegacyAuthProtocolsEnabled to true fixed the issue. I opened the SharePoint online management console and changed the ...

"The request failed with HTTP status 401: Unauthorised" The account should have the required permissions, it passed the checkboxes and it ...

If the user is not at Teams Administrator, you will see an error message like “Check LegacyAuthProtocolsEnabled: Legacy authentication”.

It starts the download then fails with a 401: Unauthorized, ... 7/27/2018 11:11:23 AM 33 (1452) Error: The remote server returned an error: ...

Error: The remote server returned an error: (401) Unauthorized. Error Message. Upload Project returns the below error: ---- Business Analyst Desktop Errors: ...

The remote server returned an error: (401) Unauthorized. ... Try to check complete detail of the batch migration and edit the information.

Exception calling “ExecuteQuery” with “0” argument(s): “The remote server returned an error: (401) Unauthorized.” Reply. BOUCHAALA. June 8, 2021 at 4:17 PM.

... error: The remote server returned an error: (401) Unauthorized. ... and verify that all of the necessary permissions have been added.