Q: iPad cannot log into Game Centre

Hi,

Anyone else having issues logging into Game Centre? I can log in on my 5S but both iPad Air & Air 2 refuses to log in. I get a "cannot connect to server" error. All three devices are on the same WiFi network.

I have checked Apple's System Status page and it shows that all is fine. if I can log in on my iPhone why can I not log in on my iPad's?

Thanks