I deployed my app and now I\'m trying to add my custom URL. I followed Firebase\'s instructions and added their TXT record to my DNS (GoDaddy). But now Firebase is saying it\'
To add a bit more information to this great solution for future reference.
DNS propagation can be monitored using a service like: https://www.whatsmydns.net/ This will show you when your records are ready, thus can be verified by firebase.
As for subdomain, ie. beta.example.com
The value would be 'beta' instead of '@' or 'example.com' for the godaddy DNS records.