I tried to login with the local username.
But it seems that the problem was not just Mattermost. We have our mobile devices managed by a MDM system. I have removed this MDM from the iPhone and then installed Mattermost again. Now it is working correctly.
After that I installed the iPhone back in our MDM system and everything is still working.
The problem was that this was the only app reacting strange, so I didn’t look the cause by MDM, but at Mattermost.
Luckely it is now working again for me.
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