Update- Issue is resolved-
Cause: Based on the generated message in the Azure EaaS screen when verifying TXT records for verification the TXT name field was shown as the domain name.
Resolution: After reviewing the TXT record fields in the Azure DNS zone, it was determined that instead of using the domain as the TXT name value it needed the “@” which is conventional for DNS TXT records.
@Sam Wheat Glad to know issue is resolved.
Kindly accept answer as "Yes", so that you can help others in the community looking for remediation for similar issues.