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 (縮網址)
就是說還在用舊版本的而不能玩的
請更新到最新版本~
如果有問題請到該網址去看看，我們所說的解決辦法~
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Some users running out-of-date versions of Pokémon GO may be unable to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.
解決辦法就是：從正常途徑去更新就對了~~XD