This post was most recently updated on January 17th, 2023. This article explains how to get rid of sudden and unexplainable 401 Access Denied errors when trying to authenticate against a fairly fresh Microsoft 365 / SharePoint Online tenant. This issue seems to be caused by a long-ish project to … Continue reading App authentication woes on SharePoint (Token request failed. The remote server returned an error: (401) Unauthorized.)
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