We apologize for the inconvenience. We have confirmed that the problem can be resolved by launching the Pokémon GO app or another Niantic app that was displayed in the pop-up window. After logging into that app, and then launching the Monster Hunter Now app again. If this does not resolve the issue, please contact Niantic Support using this form.
After the message "Sign in to Monster Hunter Now as", I tapped "CONTINUE" and got an error.
Last Updated: 50d