Is Pokemon GO's Facebook login error fixable?

Pokemon GO was well-known for its connection hiccups during its July 2016 launch, but players may still occasionally run into a connection error here and there during gameplay.

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Facebook login gateway down or not working (throws error code 2)

I received the “Unable to authenticate” or “Failed to log in” message — Pokémon GO Help Center

Pokemon Go Can't Log in with Facebook: How to Fix It?

Pokemon Go Can't Log in with Facebook: How to Fix It?

Is Pokemon GO's Facebook login error fixable?

unable to log into sharp's pokemon go with both facebook and google : r/PGSharp

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