JLAW

Thank you! Problem solved by updating to the latest iOS and iPadOS. I first had to resolve the app issue that was holding me back from updating, but once that was done the update was seamless. I'm chagrined that I left it so long.

I have the same issue, on iPhone 11 and iPad Air (3rd gen.) running iOS and iPadOS 13.6.1. This just started in the early hours of this morning (like, 3 am PDT) on both devices. Desktop versions are working fine so far today in Monterey 12.4 on an M1 MacBook Air and in Sierra(!) on a much older 2013 iMac. I have a legacy Plus account. Everything was working as it should yesterday. Did you change something in the iOS versions after midnight that would cause this crash? (And yes, updating to v. 15 is on my to-do list for this weekend.)