I rotate Unity screen with "Screen.orientation = ScreenOrientation.LandscapeLeft;" and after that FB login stop working. Without this rotation everything works fine. I had same issue with other plugins. I fixed them with this fix: replace "[UIApplication sharedApplication].keyWindow" to "[UIApplication sharedApplication].delegate.window".
I have the same issue. And it resolves when not using Screen.orientation. Would be great if someone could fix it.
+1 I also have that issue
Sorry this was an issue in Unity itself
It seems to be fixed in 2017.1.2
"iOS: Fixed the underlying behaviour of the iOS player in order to make the Unity window to be the key window after an orientation change. This was causing problems when, for example, an attempt was made to open an URL when launching FBlogin through the Unity Facebook SDK when in portrait only autorotate state. (936504, 933588)"
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+1 I also have that issue