When iOS devices connect Legends to Facebook, they select the Facebook account connected to your device's Settings, as well as the Facebook account signed into from your Safari browser.

 

If you are having trouble connecting your Legends app to Facebook, please verify that device's Settings - Facebook is signed into the Facebook account used to play TMNT Legends. 

 

If you do this, and are still experiencing issues connecting, please check that the Facebook account connected to your Safari app's browser is the same as the account that is connected to the device's Settings - Facebook.