edgeAADSTS50196: The server terminated an operation because it encountered a client request loop. Please contact your app vendor.

i have a HP notebook and edge installed and firefox

Dear Techie

    I think Microsoft should automatically delete accounts that have been inactive for a specified period of time. this likely would have prevented my problem altogether.

    The logic behind my problem seems to be that when the Microsoft system encounters conflicting data, it will reject both because computer systems are unable to determine which is true and which is not true.

    Microsoft should notify users about possible conflicting data

I had tried clearing all browser caches and it didn’t do anything for _my_ problem.  I suspect my problem was a close relative of the one in the post that follows.  I _had_ inadvertently set two email accounts up.  The poster who follows had two different phone numbers.  If this causes a problem for Microsoft account or software, it would be a good idea to set a popup message informing the user of a discrepancy in information provided or to say an account already exists.  Do you want to change/delete?

Dear Sir,

    I recently set up a new computer (W's 10 Pro)  and immediately began seeing the error message AADSTS50196  whenever  I tried to access anything from the help search bar or any Microsoft driven website. 

    I contacted my computer builder's tech team and got no help. I then did some web research and I gathered that the outlook was grim at best.

    I then started to poke about Microsoft's sign in pages etc. Bear in mind I could not create an account and I could not sign in. Through persistence and luck I stumbled onto some account information and it seems that at some point I had created a Microsoft account and the phone number listed differed from the one I had entered when setting up my new computer. I had a flash of inspiration that this was the source of the problem.

   On that page was the option to delete my phone #  (password change required) and enter a new number (another password change required). I spent 2 or three hours responding to two texted codes and at least six e-mailed codes to accomplish this.

   To verbalize my inspiration is simply that I had two phone numbers attached to the same e-mail address. The Microsoft computer system, when presented with conflicting data will reject both because computer systems cannot, on their own, determine which is true and which is not true.

    I also used the control panel to clear the browser cache because it has better options than MS Edge (I cleared everything.)  I also ran disk cleanup to delete as many files as possible.

    I am now signing into Microsoft with no problem and I have not seen that error message again.

    This may not work for everybody but, I hope will be a building block for a new approach and insight. I hope you can use this to help others with the same issue.