My iPhone updated to ios12 and now I am not able to login.
I see you merged these two problem reports. Mine is different in that I am able to login and use the iOS app. But it does not remember me when I open the app again and I have to log back in. It does not seem to honor the trust this device checkbox.
Could you elaborate? Do you see any error messages?
(edit) On second thought, you're right - probably better to keep these reports separate.
Customer support service by UserEcho