In case you didnt know, the Call of Duty: Black Ops 4 Blackout beta is now live on PC and Xbox One at least for early access players! While the PS4 version has gotten a game update to bump the player count from 80 to 88 players per match, the Xbox One and PC are still at 80.
Source: N4G PC Black Ops 4 Blackout Beta Update Rolled Out, Xbox One & PC Limited to 80 Players Per Match