[2023] Can't buy new F4S premium pack.

Las major update packs are not released on PS Store yet. Please wait for the next week.

Ah, got the consoles confused. Will check what's going on with Xbox, then. Your advise won't help, anyway, as console accounts are restricted to buying packs in their platform stores.

Can you clarify how exactly does it look for you? Are you going to Xbox store from inside the research tree?

Is the bundle available for you here? https://www.xbox.com/en-US/games/store/war-thunder-f-4s-phantom-ii-bundle/9PNXRZ0RSGD5/0010