In my case, I have a static site by GastbyJS on netlify.com, so I need to bind subdomain for my firestore hosting project, here is my workaround.
On my first, I think it maybe relate about name.com, it’s my DNS provider, but I miss a tip, netlify have been set up upon, so I need to set up on netlify.
firebase/hostingpanel and click “connect domain”
- copy verification on your clipboard
netlify/Domainsset you TXT record to verify your domain.
- wait for a few minutes
- verify on firebase panel
- Adding A records for two ip address
It’s simple and easy, but it should be knowing DNS provider who is.
Remember, you need to add authorized domains for customize domain.