SharePoint is not broken - it just does't work

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

Whilst running some SharePoint Online PowerShell commandlets, or connecting to a SharePoint Online site from your app, you get the 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…Continue reading How to fix “The website does not support SharePoint Online credentials. The response status code is ‘Unauthorized’”