Same here, can't login on Android or PC. On Android it takes me to the screen where you need to put in your email and password, so maybe an issue with an authentication server?
I am unable to log into the game on Iphone and Ipad. 2 different accounts will not log in. Message: ‘an error has occurred during log in. please try again later.’
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Did investigate, if I missed the update, which Android still had to get, but no, nothing on Google Play.
Also iPad mini 4 iOS 12.4.1
Also did as suggested last time hit the x on message.
Gave me the login screen. But, gave me same sign in error message
Good news is: this probably means everyone gets a revival token.
For the ppl still logged in all runs smooth, only affects log in itself.