Hi. Please let us know if you get a fix for this.
im having the same issue but mine is asking me for two different id’s.
I thought I fixed it a week ago by going through my entire list of apps that were ever downloaded, and ‘hiding’ the old ones I don’t use (since you can’t delete them from your account).
Then I reset my password, I reset warnings (when plugged into iTunes/finder) I have edited settings in my Apple ID like removing or deauthorizing computers etc. I deleted any app that I wasn’t using that I have had for a long time from my phone just incase. It stopped asking me and I thought I fixed it... then it came back yesterday and would not go away, every time I hit cancel on my watch, it popped up on my phone, I click not now then it comes back on my watch... it was relentless!!
but it always starts on my watch first. I don’t know if that’s just a coincidence or it’s directly related to my watch.
my phone has recently been backed up to iTunes, reset and restored (trying to resolve other iOS 13 bugs) prior to that I had reset all settings on my phone and set them all back how I like them manually (again, trying to fix bugs). This iOS 13 is horrendous for bugs, and considering we aren’t receiving any more updates lately it seems Apple is happy with the current version? I have to restart my phone to update apps, if I try manually it just doesn’t work, I tried to download an app yesterday and when I clicked get, the little wheel just spun around for ages, wouldn’t even prompt for my Touch ID, closed and tried again, but I had to restart my phone to get it to work... I’m not sure if that is related to this issue as in the phone is confused as to who’s account is on the phone?
sorry for the long post, just wanted to add every fix I’ve tried so far