Unable to register custom Domain Name

Question

Unable to register custom Domain Name

apl services 0

Issue: Register a custom Domain Name

What have I done?
I have had in Entra ID--> Custom Domains, added a new entry with MyDomain.com, on my MyDomain.com console I had added the TXT DNS record so that Azure can detect the DNS resolution among other things that Azure might require,

Current state:

After following all the required steps, every time I hit on "validate" it fails over and over.

Rukmini 43,915 Reputation points Microsoft External Staff Moderator

2025-12-29T18:07:31.59+00:00
apl services If your custom domain has already been verified in another Entra directory. You can do this by entering your domain name in the following URL to retrieve the tenant ID where it is verified:

https://www.whatismytenantid.com/

Once you have the tenant ID, verify whether it belongs to your tenant. If the tenant ID is different and you do not own that directory, the only option is to contact the Data Protection team via a support ticket to request the removal of the domain verification from the existing Entra ID tenant. After the removal, you should be able to verify the domain in your tenant without any issues.

To involve Data Protection team via a support ticket, I need a few details from you. As this information contains Personally Identifiable Information (PII), please share the following details via private message:

Custom domain Name:

Your tenant ID:

Contact Email address:

Contact Phone Number:

Country

TimeZone

Once you send me these details via private message, we can connect offline to discuss further and assist you in resolving this issue.
Rukmini 43,915 Reputation points Microsoft External Staff Moderator

2025-12-31T17:32:30.96+00:00

apl services, Please share the details over the private messages so that we can assist you further.

Your answer

Rukmini 43,915 Reputation points Microsoft External Staff Moderator

2025-12-29T18:07:31.59+00:00

apl services If your custom domain has already been verified in another Entra directory. You can do this by entering your domain name in the following URL to retrieve the tenant ID where it is verified:

https://www.whatismytenantid.com/

Once you have the tenant ID, verify whether it belongs to your tenant. If the tenant ID is different and you do not own that directory, the only option is to contact the Data Protection team via a support ticket to request the removal of the domain verification from the existing Entra ID tenant. After the removal, you should be able to verify the domain in your tenant without any issues.

To involve Data Protection team via a support ticket, I need a few details from you. As this information contains Personally Identifiable Information (PII), please share the following details via private message:

Custom domain Name:

Your tenant ID:

Contact Email address:

Contact Phone Number:

Country

TimeZone

Once you send me these details via private message, we can connect offline to discuss further and assist you in resolving this issue.
Rukmini 43,915 Reputation points Microsoft External Staff Moderator

2025-12-31T17:32:30.96+00:00

apl services, Please share the details over the private messages so that we can assist you further.