Are you planning to add session-based login? because currently, someone can use the same user on multiple phones :/ and the subscription is a bit useless because he can just give his user to other players and reuse it
As Brendan said in this post, we will be adding session-based login tokens at a later date, at which point you'll be able to invalidate previous tokens for the account on a login. But for now, to prevent multiple login, you may refer to How to prevent duplicate login? - Playfab Community.
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