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PatrickV76 avatar image
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PatrickV76 asked bmwiggins commented

Azure AD Application Proxy - "External Url entered is already in use for an application on another tenant" after tenant migration

I moved a custom domain from one tenant to another. I then deleted an enterprise application from the old tenant and re-created it on the new tenant. But when I try to change the "External Url" in the new tenant, I get an error message stating that "External Url entered is already in use for an application on another tenant." I checked the old tenant but the custom domain is gone. The enterprise application is gone. The app registration is gone. I even deleted the app in "Deleted applications (Preview)". What do I need to do more? Or is there a mandatory waiting period?

azure-ad-application-proxy
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PatrickV76 avatar image
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PatrickV76 answered JamesTran-MSFT commented

The following was my solution. A bit dirty but it works.

New tenant
- Removed enterprise applications
- Deleted custom domain
Old tenant
- Added custom domain
- Created enterprise application with custom domain
- Changed custom domain to .onmicrosoft.com
- Deleted the enterprise application
- Removed the custom domain
New tenant
- Added the custom domain
- Created the enterprise applications with the custom domain

Succes!.



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@PatrickV76
Thank you for updating the thread with the steps you took to resolve this issue! This will definitely help others facing the same issue to easily find the answer and alleviate customer pain time when it comes to this topic.

Thank you for your time and patience and I'm glad that you were able to resolve this issue!

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JamesTran-MSFT avatar image
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JamesTran-MSFT answered bmwiggins commented

@PatrickV76
Thank you for the detailed post and for your time and patience throughout this issue!

I was able to find some similar issues on our end regarding the error message you received, and based off these issues, I'd recommend opening a support request. This way our engineering team can take a look at the backend to see if there are any old/orphaned apps that could be affecting your enterprise app migration.


If you have any other questions or need help creating a support request, please let me know.
Thank you for your time and patience throughout this issue.


Please remember to "Accept Answer" if any answer/reply helped, so that others in the community facing similar issues can easily find the solution.

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@JamesTran-MSFT

I'm have the same issue in a new azure tenant that I've created.

I've fully removed everything from the old tenant and I've added my new domain to the new tenant, yet I still get "External Url entered is already in use for an application on another tenant"

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