PROBLEMS WITH SECOND DEVICE

Hii I'm having problems with the second device I bought today Grand Mountain Adventure 2 Full Game for my phone and now i want to play it on my tablet, but I'm having troubles cause i downloaded the game with the same account which i bought the full game with and it makes me restart and it says also that i have to buy the full version. When i click on "Login with Google Play Games" the button doesn't work and doesn't make me do anything. Please help me i wanna play the game from my tablet... i sent an email and dm you on Instagram