Game had disappeared from Xbox Store since EA Access (Hungary)

The game appears to me in the Hungary store, but only with "search".

if a player disappears from your roster, you will need to contact EA since they are the ones that run online portion of the game.

I know you stated that you tried the console reboot trick but did you try power cycling your xbox one. Power cycling is a bit different. When done properly you will see the green Xbox start up screen. If you rebooted but did not power cycle give it a try.
Hold down the xbox button located on your console for 10 seconds. The console should power down, then turn it on again by pressing the xbox button. I also see you purchased the game from the microsoft store but do you have EA access by any chance?

I have ea access and recently had this same issue with a game available from EA access. If you have or have ever had ea access I was able to fix this same issue,but with anthem, by hard resetting my console and uninstalling then reinstalling the EA access
app.

Since you bought it in the EA Access store it's their duty to provide support since you can't play their game bought from their store. If you've been previously told by EA Support that is not their fault is surely just be an employer who doesn't know what
they're talking about

I would suggest to keep trying to reach EA support, i know it's not fair for you to keep asking for help from them but this is the only thing i can think right now. Hope it helps.

I had a friend that had a similar issue, what they did to fix it was remove the game and restart their xbox. They than navigated to their EA access app and downloaded it from there again. This somehow allowed it to signify that it was the EA access 10
hr trial.