"The app name is not available" error when transferring web app between tenants

Question

"The app name is not available" error when transferring web app between tenants

Peter 5

I want to transfer a specific web app from a subscription under tenant A to a subscription under tenant B. However, when I try to recreate the app in tenant B, I receive an error message: "the Site Name "" failed the availability check: Hostname '' already exists. Please select a different name." I can recreate the web app under tenant A, but not under tenant B. It seems like tenant/subscription A is still reserving the app name. Is there a way to release or transfer the name so that I can use it for the web app in tenant/subscription B?

Mauricio Marzol 1 Reputation point

2024-03-19T03:53:21.9266667+00:00

I'm having the same issue.

Is there any solution other than reaching out to AZ Support Team?

Thank you.

1 answer

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Mauricio Marzol 1 Reputation point

2024-03-19T03:53:21.9266667+00:00

I'm having the same issue.

Is there any solution other than reaching out to AZ Support Team?

Thank you.

Answer 1

Ben Gimblett 4,560 Microsoft Employee

Hey Peter - thanks for your question

An App service resource (and this includes variants built on App service such as Azure functions) must have a globally unique name - this is because the name you give will be a subdomain of the Microsoft owned DNS http://<app-name>.azurewebsites.net
REF
https://learn.microsoft.com/en-us/azure/azure-resource-manager/management/resource-name-rules#microsoftweb

If you already removed the App there may be a small time to wait until it becomes available again (one of my support colleagues who monitor this forum may be able to add more)

In general it's more flexible to assign and use a custom [DNS] name so you do not have a direct dependency on the default name.

Peter 5 Reputation points

2023-11-13T14:48:32.41+00:00

Hi @Ben Gimblett

Thanks for your response.

The resource was deleted some days ago and the name is still blocked.

We got a naming convention at our company for our resources.

That's why I need exactly this name again.

Force delete App Service, to reuse azure domain - Microsoft Q&A

Could it be, that this is my problem too?
Ben Gimblett 4,560 Reputation points Microsoft Employee

2023-11-13T14:58:14.6166667+00:00

One thing that used to happen occasionally (and the less random the name, the more chance) is that between removing and re-creating the name gets taken by another customer

I dont know a whole lot about this but there were changes made that indirectly helped to mitigate this (which was affecting customers with devops pipelines for example) - although i think the primary use case was to protect customers from dangling domains

REF https://techcommunity.microsoft.com/t5/apps-on-azure-blog/name-reservation-on-app-service-for-web-apps-and-app-service/ba-p/3675100#:~:text=Name%20Reservation%20ensures%20that%20in,resource%20with%20the%20same%20name.

As you are trying to re-create cross tenant it could be that you are being impacted by this safeguard

I am not sure of the mechanics here or whether (in your case because it's a genuine reasons for wanting to re-create the app) the original can be purged.

I think you would need to raise a support case and check with support the options here
Peter 5 Reputation points

2023-11-13T15:06:06.9933333+00:00

One thing that used to happen occasionally (and the less random the name, the more chance) is that between removing and re-creating the name gets taken by another customer

It is possible to create the app service with the same name on the original tenant again. So I don't think the name is taken by another customer.

Where can I create a support case for my issue?
Ben Gimblett 4,560 Reputation points Microsoft Employee

2023-11-13T15:27:12.03+00:00

Hi Peter - please see the landing page here https://azure.microsoft.com/en-gb/support
Peter 5 Reputation points

2023-11-14T15:32:40.3566667+00:00

Unfortunately, you can only submit a support request there with a paid support plan.

Can someone tell us when a feature will be released that will allow us to release the name reservations ourselves?
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brtrach-MSFT 17,731 Reputation points Microsoft Employee Moderator

2023-11-16T04:36:25.04+00:00

@Peter Hi Peter, can you please reach out to us at azcommunity@microsoft.com with the subject as ATTN: Bryan and in the body of the email please include your Azure subscription ID. We look forward to your reply.

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"The app name is not available" error when transferring web app between tenants

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