How to fix “The web site does not support SharePoint Online credentials. The response status code is ‘Unauthorized'”

This post was most recently updated on March 3rd, 2019.While running some SharePoint Online -PowerShell commandlets, or connecting to a SharePoint Online site from your app, you get a following (or similar) error about your SharePoint Online credentials being unauthorized for something you should definitely be authorized to do: Cannot contact web site ‘https://[tenant]-admin.sharepoint.com/’ or the web site does not support SharePoint Online credentials. The response status code is ‘Unauthorized’. And that’s not all – by digging into the full error message, you find the … Continue reading How to fix “The web site does not support SharePoint Online credentials. The response status code is ‘Unauthorized’”