@GoldenHelmet no, I definitely hadn’t changed anything on the Microsoft/XboxLive side.
(I have painful prior experience of how doing that crashes Minecraft for a day or two - so I avoid it whenever possible.)
My feel was that I managed to delete something that forced a logout in the app. Not possible any other way as the app would crash too quickly to logout from within the app. But I don’t have the technical expertise to know which thing I deleted may have done that!
@Michael Vorobets - I can only suggest finding files in the iOS Minecraft folder that are dated around when the issue started, and delete those. I haven’t had or been able to reproduce the issue since I got it fixed (with 6 minecraft players in the family). I don’t think it’s the worlds, but I do suspect it’s one of the many resource packs that got installed - although I can’t reproduce this to back it up. Good luck.
Yep. Deleting what I did above seems to have completely resolved it, with no adverse effects. For my issue, it did crash the app when offline (no internet connection at all).
I could log back in after that and everything was back to normal.
Don’t think it would have been reported automatically though given the speed it crashed at, and that it happened even when not online.
Ok, I made progress with this despite no help via the official channels and nothing via google.
My method - using the iOS file app, I went in and deleted every file I could find dated since around when the issue started to happen or later (some seem to update whenever I try and open the app). I suspect it may have been deleting the ClientID file that did it. I.e. triggered a log out from outside the app and got past the homescreen crash. I also suspect it’s been caused by one of the resource packs or skin packs that got installed. Will update it if comes back or/and if I can reproduce the fix or narrow down what led to the fix.
@GoldenHelmet No idea unfortunately. I took a shotgun approach due to frustration!. And as it didn’t happen again, I couldn’t investigate further.