If you are facing ‘Unable to Authenticate’ error in Pokemon GO on iOS while being registered on Trainer Club after installing 1.01 update in this article you will find all possible solution to fix this error.
Some users around the web noted that if a player has registered Google account which he uses while playing the Pokemon GO, the error on 1.01 update doesn’t appear. However, we recommend to skip the all new Pokemon GO updates until further developer notice regarding app’s functionality.
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