ODST Firefight Crossplay Not Working

My friend just got the Master Chief Collection on the Xbox. I am a PC player and I only just found out the campaigns don’t have crossplay so I recommended that we could try Firefight. So we kept trying to get ODST custom firefight to work, switching party leaders aswell, but in the loading screen his name disappears and I eventually am also sent back to the main menu with no error message. I’m just on the main menu and no longer in a party. Is there a fix to any of this or is there just nothing I can do?

Any resolution?