Hello!

Cheto:
game Center is not supported at this moment! but yes there is solution for it.

Follow these steps!
1- installtion orignal PUBG from appstore
2- log in with your game center.
3- go to settings PUBG
4- go to general and click Link
5- link your account with and email.
6- Done

ready!
go ahead install PUBG cheto, and login with your email instead of GameCenter!

Cheers!