I'm not sure why it's this way on Xbox, but you'll have to have a subscription to Game Pass Core to play FFXIV online in addition to the FFXIV subscription and game purchase.
The Free Trial version, including the open beta test, will not require an Xbox Game Pass (Core or Ultimate) plan to play. However, the full Xbox Series X|S version will require an Xbox Game Pass (Core or Ultimate) plan to play.
Square-Enix Link
GameSpot Article
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