This morning there were reports on the MSFS forum that those of us who had been on the beta suddenly got a complete reinstall of MSFS24, and all their configs etc were lost. Those with default Community folder locations also lost all that. So I thought if I didn't touch the sim it'd be sorted by the time I used it next. However I've just noticed that my sim has disappeared, the MS Store download list just says 'something happened on our end'. Yeah, right.
I've been pretty positive about the teething issues with MSFS24, as I'm sure the same thing happened with 2020, but maybe it's time to find a new hobby again.
Good luck Rob, I hope it works out.