"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."
This bothers me. I lost my linked PSN account. Unfortunately, ticket after ticket won't let me recover it. I've made peace with that. Luckily, I also have an Xbox. Now I don't care. Good job messing that up. Now, two subscriptions are required to play on the Xbox unless you're on the Free Trial...
You really messed up on this one. I wouldn't be surprised if this is discontinued after a time.