Ditto. Just started yesterday when I changed my iCloud password. I do it roughly every six months and have done it many times before without issue.
Did it yesterday and all hell broke loose. Definitely something screwed up with end to end data and it’s now affected all my devices.
Messages in the cloud, keychain, Apple Pay, etc, all not working. Endless “Update Apple ID settings” loop.
Tried everything I could think of. Even erasing and setting up from new did nothing. Ironically, my iPad is also the only device that has my passwords still on it.
Apple support has kicked it to the engineering so we’ll see what happens.
Attached are some pics to give a visual.
@ivanpasic, is this what you’re seeing?
I had something last year where my passwords would not sync across devices. Apple using end to end is great, when it’s working. When it’s not, though, it’s a giant pain in the ass.