@untraced0879 The record you have is incorrect:
The instructions are here:
https://answers.netlify.com/t/support-guide-another-site-is-using-this-domain-verifying-domain-ownership-for-netlify-production-domain/13765
The name should be verified-for-netlify
The value should be:
https://answers.netlify.com/t/deployed-website-with-custom-domain-was-deleted-by-a-security-flag-now-cant-add-domain-again-after-id-verification/137993