Having the same issue, roughly 10+ seasons in.
Xbox Series X
League: Enumclaw
Gamertag: Rotten Mattress
Users: 2 (recently added a 3rd to adjust CPU depth charts the exact week of the crash, unsure if related to issue, as I have done this once without issue in the past).
I get the league unloaded message when trying to advance. My friend gets the league is temporarily unavailable message instead when he readies up.
Ive tried force advancing, putting people on auto pilot, adding a 3rd user and readying, only to get the error message and thrown back to the main menu.
changes within the dynasty seem to be saving through. Like if I edit a player, try to advance and crash, and go back in the league the player is still edited. So it’s updating but not advancing.
we have 2 team builder teams (CPU).
edit: I am now getting forced out of the league regardless of what I click, after about 5 seconds. I am in week 9 of 2034. The main/Weekly to do List tab is now completely blank. This league has been running since release. Friend isn’t readied up (can’t), but I (commish) am. I added a 3rd user with another account, where I made position and depth charge adjustments. I clicked ready to advance before retiring from the league. I don’t know if issue already existed prior to doing this. I did not see any bricked/12ovr players on any of the teams.