Logging into any game or app with your Facebook account makes a lot of sense. It makes the process a lot easier and faster, so all you have to do is click a single button to get back to your business. While accessibility is present if Facebook is facing issues that could spell disaster for people using this method to log into games like Pokémon Go. Here's how to fix Facebook login error on Pokémon Go.
If you are trying to log into your usual Pokémon Go account using your Facebook login and you see the message “An error occurred while signing in to this application. Please try again later ”, unfortunately you will be stuck waiting for the Facebook service to come back online.
While you are always free to quit the game, shut it down and restart it to try again, this problem has to do with the game not being able to find your login credentials because it cannot log into the Facebook website. It would be the same if you used Google login and that service was disabled for a long period of time.
Unfortunately, Pokémon Go doesn't have another way to enter your login credentials from your Facebook account, so you're stuck waiting for the service to become available again. If you have another account that you've used with Google or the Pokémon Trainer Club, you can try logging in with them to see if it's a Pokémon Go issue, but you won't be able to use the associated Facebook account in that case.
