Hello @Parthasarathy Kothandaraman , Welcome to the Microsoft Q&A forum.
If you are using Azure FrontDoor premium/standard, can you try doing a nslookup for your TXT record and see if it is propagating and also validate that you have entered the correct record value in azure portal. You can try this command nslookup -type=TXT dnsauth.<your_subdomain>
. If TXT record does not show up, please check with your DNS service provider. Alternatively, you can also use this website to lookup your TXT record.
As documented here If it is in ‘Pending’ even after the TXT record is updated in the DNS provider, please try to click ‘Regenerate’ to refresh the TXT record and add the TXT record to your DNS provider again.
If you are using Azure FrontDoor classic and have added the CNAME record pointing to your AFD endpoint and the custom domain validation is still pending. I will suggest that you create a support request for this issue as we will have to look at the backend logs to find out why exactly the custom domain validation is stuck. If you do not have a support plan please refer to the private message I will make here shortly.
Please let me know if there are any concerns, Thank you!