Given URL is not allowed by the Application configuration

I'm getting the error message below when trying to login to my BP site. I have Ultimate Facebook installed. The App (ID/Secret) was created on my Facebook for another Multi-Site domain. I didn't think that mattered, but maybe it does? Any thoughts ...

ERROR MESSAGE: "Given URL is not allowed by the Application configuration.: One or more of the given URLs is not allowed by the App's settings. It must match the Website URL or Canvas URL, or the domain must be a subdomain of one of the App's domains."