Firebase Hosting: We couldn't verify your domain example.com. Please check your settings and try again [closed]

I tried to add my custom domain to firebase hosting. But firebase can not verify. Though I add txt record in my domain control panel. Here is the the

Remove your domain name and Add @ instead of your domain.

For future reference replace host with @ instead of example.com. (for godaddy, namecheap, 1and1 ...)

Firebase help :

Value for host names may differ based on each DNS provider. For example, some DNS providers use '@' for your root domain name. For subdomains, it could be 'www' or 'www.domain.com'

Here's the steps I'd use:

1. DNS registrar / records host: delete TXT records pointing to firebase.
2. firebase console: delete the custom domain.
3. firebase console: add custom domain.
4. copy the two A records from firebase to DNS host
   • DNS record host may take @ for the "host" rather than "example.com" or "www.example.com"
5. save A records in DNS host
6. if DNS host has an SPF TXT record add "v=spf1 include:_spf.firebasemail.com" before the "~all" and without the quotes; I don't suggest deleting this record if already there, just add to it.
7. wait 24-48 hours to see if the changes work
8. if it doesn't work, contact firebase support from the console; be sure to take screen shots of the DNS records and the firebase console. These will help the firebase support team to troubleshoot the problem.

NOTE: I'd use Frank's info to check if the site is propagating and to check what it returns. If the firebase spf info is missing, see step 6.

NOTE 1: I also don't know why it's necessary to add the firebase spf record if you're using a non-google email provider. My understanding was that SPF is for email. But, adding it helped me with 2 websites that weren't propagating.

Be patient. It can take up to 24 hours to propagate.