Yammer is the worst for that. And the worst, just in general.
Login -> 2FA -> Loading state for 20 seconds -> Content pops in -> Whoops, back to login.
This cycle repeats 3-4 times before it settles down. Then all the other Microsoft apps decide I’m no longer logged in and have to do the 2FA dance for every. Single. One.
Some days I end up running out of 2FA tokens and am unable to log into essential systems. It’s maddening.