When viewing our app, there was a message saying we needed to migrate our existing app page to a normal Facebook Page. It said we didn't already have one, and there was no option to create one automatically, so we created a new Facebook Page for our app, selecting the "App" category as stated on the message. However, when we went back to the app to migrate it to this new page, the option for migration was no longer there, and trying to visit the app directly from facebook search or a post made by it now results in an error message (as it's not a canvas app, but an external one using Facebook Connect).

Looking through the app settings, I've found there is now an option in there to create a new page for it, but the main issue with that is that we've already created a page for the app separately (as the original migration message implied we needed to do), so we really need that page to be linked to the app as it already has the correct username set on it ("Spotamo", which we really don't want to lose, as it is the name of the app and service so nothing else would make sense for it).