Was wondering if someone could help. I have an asmodee account from other games, and when attempting to sign in to the game, it gave me an error saying it could not link the account to playfab? I am wondering what the issue might be. I'm running the most current version from the iOS app store on a iPhone 5s.....any help is greatly appreciated. 

Check that you're logged into iOS Game Center.

 

Open up the Settings app and scroll down about a third of the way.  It should be right above Twitter and Facebook settings.  Sometimes iOS logs you out when you aren't paying attention...