1. Make sure you have a stable internet connection. 2. Check to see if your username and password are correct. 3. If you have the Facebook app installed on your device, log out of it (or delete and reinstall it). 4. Log out of your Facebook account in all browsers installed on your device (Chrome, Opera, Safari, etc.). 5. Restart your device and try to connect the game to Facebook again.
For iOS devices: 1. Go to your device’s Settings -> Facebook. 2. Make sure the game is listed under Allow these apps to use your account and that permission is turned on. 3. Delete your Facebook account from the device settings (tap your name -> Delete Account). 4. Reset your advertising identifier (Settings -> Privacy -> Advertising -> Reset Advertising Identifier). 5. Uninstall the Facebook app from your device. 6. Open your browser -> open your Facebook account page -> log into your account. 7. Try to reconnect to Facebook in the game settings.
For Android devices: 1. Go to Settings -> Accounts. 2. Tap Facebook -> Remove. 3. Remove the game from the list of applications on Facebook. 4. Restart your device, enter the game, and try to reconnect it to Facebook.