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Hi @thr333one,
When adding the google._domainkey as a TXT DNS record or any DNS record infact, this is always added to the domain, it’s just how DNS works
Example: I have a domain example.com I want to add a TXT record to that domain. There are two possibilities, add it for the main domain - example.com or like in your case add it for google._domainkey. When you add it for google._domainkey it automatically picks it up as being part of the main domain - google._domainkey.example.com. That’s the proper way for a DNS TXT record or again any other DNS record to look like.
Please note that you might need to wait sometime before Gmail star seeing your DNS. Usually, the DNS propagation period can be up to 48 hours.
Regards, KFSys