You can’t create a new campaign with this iTunes App ID as it’s already being used

I have a question about creating an advertising campaign. I've searched through a lot of information and tried many times without success, so I have to seek help here.
When I try to create an advertising campaign, I'm prompted with "You can’t create a new campaign with this iTunes App ID as it’s already being used." I did indeed use the same iTunes App ID to create a Facebook app in the developer account before. However, I can't log in to that account anymore, so I can't delete the binding relationship between the app and the iTunes App ID. I'd like to know if there's a way to revoke the authorization of other Facebook apps for this iTunes App ID. I can provide all the evidence to prove my absolute ownership of this iOS app (iTunes App ID). Thank you!