Problem signing in to RDP on iOS

Question

Hello,

I have been using RDP for ipad to access my windows computer for a long time.
https://apps.apple.com/us/app/remote-desktop-mobile/id714464092

I recently replaced my windows 10 pro Microsoft account email with a new Microsoft account email and after that I can no longer login using that email. with my previous email it worked fine.

I can however sign in to RDP using my local account, but that is not what I did before and not what I want because I do not use that account on my computer

I have checked the Remote Desktop User group dialog and added all possible users that was available but it still does not work. and I have tried to enter all possible combinations of login name computer name, ip adddress, backslash , forward slash dot etc...

On thing I noticed is that when I add the Microsoft user to the remote desktop users group it is truncated, it does not say my whole email, just the first 5 characters.

I have also tried to login to Windows using my password instead of PIN but still no luck.

when I sign in to my Microsoft account on the web I use the Microsoft Authenticator app to sign in, is that an issue?

please help.

thanks in advance
Thomas