Azure Function Namespace stuck

Question

Well...I am working in a project to a client. So, I've my DEV environment whose subscription belongs to our company and my Client has his own subscription...

Due name conventions, we should use a very specific name for the Azure Functions Resource. In our subscription, we created, for example: alpha-alpha43783428798429784.azurewebsites.net

Then we deleted alpha-alpha43783428798429784 so we can create with the very same name on the client's subscription since namespaces should be unique, right ?

The problem is...After deleted, When I try to create alpha-alpha43783428798429784.azurewebsites.net on the client's subscription, it says: the app name alpha-alpha43783428798429784 is not available.

It's because in some how, even deleted this name are still attached to our subscrition. If I try to create alpha-alpha43783428798429784 on our tenancy, azure will accept it with no errors.

I really need a way to release this name so I can use it in another subscription. Any ideas ?

Answer 1

Marco S. Junior Thanks for posting your question in Microsoft Q&A. This behavior is likely as per design to prevent subdomain takeovers and refer doc Mitigating subdomain takeovers in Azure App Service & Name Reservation on App Service for Web Apps and App Service Environment (ASE) for more info.

Upon deletion of App Service/Function app, the corresponding DNS is reserved for a cooldown period (vary based on the subscription; min 30 days) and DNS is forbidden except for subscriptions belonging to the tenant of the subscription owning the DNS. In your case, it appears to be different and hence the error the app name alpha-alpha43783428798429784 is not available. We might need to review the backend logs to confirm if this is the cause.

If you have a valid business scenario to create the same function app in different tenant (before cooldown period), then you can open a support ticket with our azure support team. They can assist you further with this request. I hope this helps.

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