I am experiencing the same issue with a Motorola Z Play android 7.1.1. I have tried uninstalling and reinstalling both Pathfinder and Google Play Games as well as deleting cache and data in both and the problem still remains. I have a feeling the issue may deal with google play services but my OS won't let me disengage these services to clear the cache. when I look at my log it states that validation fails for google play services. Other games work okay and log into google play without issue.