Trainers running version 1.7.1 for iOS and 0.37.1 for Android or earlier may
experience issues using Pokémon GO. Ensure your Pokémon GO app is updated
to the latest version from the Google Play Store or iOS App Store to resolve
these problems.
For instructions on how to update your application, or more information
regarding this issue, please visit our Help Center for a resolution:
http://0rz.tw/stMvD (缩网址)
就是说还在用旧版本的而不能玩的
请更新到最新版本~
如果有问题请到该网址去看看，我们所说的解决办法~
I’m unable to access Pokémon GO on earlier versions
Some users running out-of-date versions of Pokémon GO may be unable to
access the game. If you've received the “Unable to Authenticate” message
while running an old version of Pokémon GO, please update to the app in the
Google Play Store or the App Store to resolve this issue.
解决办法就是：从正常途径去更新就对了~~XD