Custom domain verification failing

Question

Custom domain verification failing

Subroto M 0

Despite matching exactly with domain record. It fails to verify the custom domain.

Praneeth Maddali 5,730 Reputation points Microsoft External Staff Moderator

2026-02-26T02:22:20.6233333+00:00
Hi @Subroto M

Thank you for your message. To ensure we provide the most accurate guidance and avoid repeating any steps you may have already completed, could you please help us by confirming the details below?

Which Azure service you are attempting to verify the custom domain for (for example, Azure App Service or Azure Communication Services Email).

Confirmation that the TXT record is added at the root domain (for example, example.com) and not under a subdomain such as www.

The exact TXT record name/host and value as configured in DNS, and confirmation that there are no extra spaces or quotation marks.

Whether the TXT record is publicly visible using a command such as: nslookup -q=TXT yourdomain.com

Whether there are any duplicate or older verification TXT records present for the same domain.

After adding the TXT record, did you remove and re‑add the custom domain in the Azure portal, or only attempt verification multiple times?

Confirmation that the DNS zone is public (not private) and that you have full permission to manage DNS records for the domain.

Once we have this information, we’ll be able to provide precise next steps to resolve the verification issue.
Praneeth Maddali 5,730 Reputation points Microsoft External Staff Moderator

2026-02-27T06:44:10.3366667+00:00

Hi @Subroto M

Just following up to see if your issue has been resolved or if you had a chance to review my earlier comment?

1 answer

Your answer

Praneeth Maddali 5,730 Reputation points Microsoft External Staff Moderator

2026-02-26T02:22:20.6233333+00:00

Hi @Subroto M

Thank you for your message. To ensure we provide the most accurate guidance and avoid repeating any steps you may have already completed, could you please help us by confirming the details below?

Which Azure service you are attempting to verify the custom domain for (for example, Azure App Service or Azure Communication Services Email).

Confirmation that the TXT record is added at the root domain (for example, example.com) and not under a subdomain such as www.

The exact TXT record name/host and value as configured in DNS, and confirmation that there are no extra spaces or quotation marks.

Whether the TXT record is publicly visible using a command such as: nslookup -q=TXT yourdomain.com

Whether there are any duplicate or older verification TXT records present for the same domain.

After adding the TXT record, did you remove and re‑add the custom domain in the Azure portal, or only attempt verification multiple times?

Confirmation that the DNS zone is public (not private) and that you have full permission to manage DNS records for the domain.

Once we have this information, we’ll be able to provide precise next steps to resolve the verification issue.
Praneeth Maddali 5,730 Reputation points Microsoft External Staff Moderator

2026-02-27T06:44:10.3366667+00:00

Hi @Subroto M

Just following up to see if your issue has been resolved or if you had a chance to review my earlier comment?

Answer 1

Hi @Subroto M
Addition to praneeth response If the custom domain verification is failing even though the DNS record matches, the most common cause is that Azure cannot yet resolve the verification record from public DNS. Ensure that the DNS record is created exactly as required in the Azure portal (usually a TXT record such as asuid.<subdomain> with the verification value or the required CNAME/A record depending on the service). Then verify that the record is publicly visible by running a DNS lookup (for example nslookup -type=TXT yourdomain.com or using an online DNS checker). Also confirm that the record is added in the correct DNS zone, there are no duplicate or conflicting records, and the domain is not already mapped to another Azure resource or tenant. If the record was recently created, allow time for DNS propagation, then refresh and retry the verification in the Azure portal. Once Azure can resolve the correct record from public DNS, the custom domain verification should complete successfully.
https://learn.microsoft.com/en-us/troubleshoot/azure/app-service/connection-issues-with-ssl-or-tls/troubleshoot-custom-domain-issues-azure-app-service
https://learn.microsoft.com/en-us/azure/app-service/app-service-web-tutorial-custom-domain?
let me know if you have any further assistances needed

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Custom domain verification failing

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