Accessing Microsoft Teams using organizational or personal credentials
I have been able to consistently reproduce this issue. If a user logs into ServA, they get the sign-in error. If you click on sign-in message is cleared. If you logout, then log back in to ServA, no message. If you login to ServB (first time) you get the error again. Sign-out and go back to ServA (no error). Go back to ServB (error), click sign-in - no more error. Essentially the first time a FSlogix profile is used on a new machine the error occurs. Once users have logged into each host at least once (and clicked "sign in") the error goes away.
When we publish a new image, or expand the host pool - the problems start all over again.