Played the free trial of Endgame and that worked fine. Black Ops Royale just doesn't work at all. I've tried reinstalling the game and removing the free trial, no luck.
It seems like I can't access the Warzone version of Avalon but I can access the Endgame version with no issues.
To clarify, I can queue up for both Quads or Solos, but the map just never loads and I stay in the menu the entire time. When I join a party, everyone gets into the map except me. I'm still in the menus while they're jumping out of the plane.