It can be anything! An apex, subdomain, or even a URL.
Results for_custom-domain-55cbe38d-b188-4cb4-9834-31a5a1cffeca.compasstip-web-fb-app-hosting2--compasstip-1570093751131.us-central1.hosted.app
www._custom-domain-55cbe38d-b188-4cb4-9834-31a5a1cffeca.compasstip-web-fb-app-hosting2--compasstip-1570093751131.us-central1.hosted.appcompasstip-web-fb-app-hosting2--compasstip-1570093751131.us-central1.hosted.appus-central1.hosted.apphosted.appapp