Turn on DKIM in Google Workspace
Google Workspace mail uses addresses at your own domain, and Google signs each message. That signature is DKIM. Google has to create it. A guessed value will not work.
You still paste the record at GoDaddy, Cloudflare, or wherever the domain lives.
What to do
- Sign in at admin.google.com as an administrator.
- Open Apps, then Google Workspace, then Gmail, then Authenticate email.
- Generate the record if it is not there yet. Copy the DNS host name and the TXT value.
- Add that TXT record at your domain company.
- Back in Google, start authentication. Then run the grade again.