Was dealing with this same issue after Week 16 last night. Did end up fixing it ourselves and thought I’d share our solution for other folks struggling. We are a 14 user cross-platform cloud dynasty with custom coaches and conferences. We had the HC of Maryland leave during Week 14, as they are going to be traveling and will take over a new team when they return. We did not have any issues advancing until Week 16. This issue was caused by the player leaving. After Week 16 is the coaching carousel and what I believe was happening was when a user created coach leaves a team, they are replaced with their old team HC instantly; the created coach is instantly deleted. That old HC was already in the carousel as an available coach. Removing him from the league during this pivotal time created either two copies of the same coach or told the game he needed to be in two places at once (the HC of Maryland AND the coaching carousel), thus crashing at advance.
SOLUTION: We had a new player take over as a custom coach of Maryland and ready up to advance. When we get to the actual offseason where custom conferences are executed we will remove him once again.
I am willing to bet that this fixes it as it aligns with pretty much the same thing that happened in our league. The only problem is that we had people swap teams a few times to see if it fixed it. We will need to spawn in a new friend to have all of the former teams occupied to see if that fixes it.
