There's something incompatible there, MS Authenticator refuses to accept the auto-generated QR code...
It did accept it on a second try, weird. I haven't seen that one before.
And then the transaction has expired, and I had to restart authentication. Entering the code from a previous registration, but it re-starts the login sequence from the start - just tried a couple of times. Without raising any exceptions in the debugger.
So, I'm stuck in an endless login sequence ;-(
Can you please provide steps to reproduce the issue using the Sphinx demo?