So i downloaded the game on my new phone but the button for facebook login isnt there. Its judt empty and i csnt fix it... i also dont get a msg when starting the game

Hi and welcome to forum

you mean you didn't get the age question message when you start the game ?
AS usually the fb connection option disappear when the age entered is below 18

https://forums.socialpointgames.com/topic/7862/missing-the-option-to-connect-to-facebook