I am having the same issue. I installed iOS 15 on my old iPhone 8, then when my new iPad pro arrived and I tried to set it up I got an error trying to setup my Apple ID. And now the error has propagated to all my devices, even making my main iPhone 12 lock up temporarily when trying to access features related to my Apple ID. At a loss of what to do at this point. Have since taken iOS 15 off my old iPhone 8 but looks like the damage was done and now I’m stuck.
Pmrl1975
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