"Unable to authenticate" or "Failed to log in" error when logging in to Pokémon GO
These error messages may indicate a temporary issue with the servers. First, close and then reopen the Pokémon GO app: Android: Double click the Home button to view the most recently used apps, loc...
... in using your Pokémon Trainer Club account username and password. After you sign in, a new game of Pokémon GO will begin. Facebook · Twitter · LinkedIn.