Same here, on multiple iOS devices.
Tried: Rebooting, tried from Wi-Fi, Cellular Internet, re-downloading the game, different gamecenter ID, and it was working all afternoon for me until just now.
Issue is the same on:
iPhone 6 - newest iOS version (11.2.1 / 15C153)
iPad Air 2 - (11.2.1 / 15C153)
iPad Air 1 - (11.1.2 / 15B202)
Account: Enyeez (?)
EDIT! Im in!
Last edited by Enyeez
on Tue Dec 19, 2017 8:26 pm, edited 2 times in total.