Hi Aki, I failed to disclose that the described problem occurs on iOS 13.0 beta.
After trying again and again, it appears that a bug in iOS 13.0 beta is the likely culprit. I am reading on Reddit that there is some bug in iOS with certificate trust... https://www.reddit.com/r/signal/comments/c2q6c6/anyone_using_signal_in_ios_13_beta_iphone/ Kind regards, Peter Kahl
0x526F0AC69C48DEE4.asc
Description: application/pgp-keys
signature.asc
Description: OpenPGP digital signature
