GW2 crashes on start up but only on my kids' accounts?

I recently thought it could be fun to play split screen with my kids on the xbox x since it allows split screen local co-op. The game is extremely slow to load on my own account and on my partner's account, but when I try to open it on my kids' accounts, it crashes after connecting to the servers. Something flashes on the screen but when I say flashes, I really mean flashes - there's no way for me to tell what it is. My kids are old enough to play the game within its rating and I can't find anything in their account settings on Xbox that should prevent them from accessing the game. As I can't find the problem, I can't resolve it on my own. Any tips or ideas on what I could try?