An Xbox Game Pass subscription is not necessary to play. Call of Duty: Warzone 2.0 falls under the free-to-play standards.

Is there Warzone 2.0 early access? You'll need to wait until November 16 to play Warzone 2.0 and DMZ. Unlike other Call of Duty games, Warzone 2.0 does not have an early access period. It will go live for all players worldwide, simultaneously.