the easiest way to get it is to go to any EA title in the Xbox app on PC etc. and click install, Xbox will give a box that says you need to install the EA play app, click install/ok and Xbox will automatically install it for you
i can vouch for this, 17 August 2022.
Tried the same thing and its work
1. Bought the game pass in xbox
2. Download EA in app from xbox (red colored EA)
3. install any game
4. EA app pop up and ask for log in
5. Log in using your preference old EA account (in my case the one that i use in Origin)
6. Confirmation box will appear to linked between your preference EA account with xbox account ( there will be EA username and xbox username, so it wont be mistaken).
