I can't connect an app to facebook

[AC Question]

Some are connected to my Facebook account but one app keeps saying I need to login to Facebook but wen I do it says Iv already allowed Facebook use that account but it's not logging in I think it's connecting through my Samsung account

 

[B. Diddy]

Welcome to Android Central! Try going to the App Manager, select that app, then Clear Cache/Clear Data. Now open the app again and try connecting through Facebook.