I was able to solve the problem.
In my case, I would attempt to access Microsoft support (link below) using Edge in order to find my Windows 10 product key for my brand new computer that is three days old. The screen would load, and then I would get the error message in this thread.
I finally solved the problem by installing Firefox (https://www.mozilla.org/en-US/firefox/download/thanks/) .
Edge didn't work but Firefox did. I can now access the page no problem.
(Web page that would cause the problem.)
https://support.microsoft.com/en-us/help/10749/windows-10-find-product-key
(Error message that I would get)
Sorry, but we’re having trouble signing you in.
AADSTS50196: The server terminated an operation because it encountered a client request loop. Please contact your app vendor.
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Request Id: 4cb2f2b5-6e02-4498-8b11-c600a429df00
Correlation Id:
5fed80ae-b2ab-4b24-b3fe-1ff9540a8a80
Timestamp: 2020-07-13T21:14:35Z
Message: AADSTS50196: The server terminated an operation because it encountered a client request loop. Please contact your app vendor.
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