As unity mentioned in a personel edition we can ony have 50 concurrent players but my questoin is what does it mean ?
(1) - we can have 50 player playing in a single scene in a single room and there is no limit on no. of rooms you can have in game.
(2) - you can only have 50 player no matter how much rom you create.
Of course the second one. The scenario you make is totally relevant to your implementation and server subscription doesn’t have to do anything with it.
Only 50 concurrent players can play the game in the personal tier as you are saying means that there can be 10 in room 1, 13 in room2, and so on until total concurrent player (player playing games at the same time) are not more than 50 you are good.
Unity Forums would be a really better place to get answers to questions related to subscriptions, memberships, services clarifications.