Accessing Microsoft Teams using organizational or personal credentials
I had the same problem and got it resolved.
What I tried that did not work.
- Reopening Teams repeatedly.
- updating my iPhone to latest
- deleting and reinstalling Teams
- replacing my screen protector. :-)
- changing settings in "settings" for teams
What I did that worked
- Go to my company managed (and created) directory-app and do a sync "sync directory"
My Teams app opened and stayed open directly after doing this operation
Where do you find this? --> my company managed (and created) directory-app and do a sync "sync directory"