Unable to delete Custom Authentication Extension in Enterprise Applications

Question

Unable to delete Custom Authentication Extension in Enterprise Applications

WaldemarL 20

When attempting to delete a Custom Authentication Extension in the Enterprise Applications section, the following error message appears (GUIDs have been removed for security reasons):

Cannot delete custom extension <GUID>: The custom extension is in used by the listener of id <OTHER-GUID>

The associated App registration was deleted successfully, but the extension remains undeletable.

The main concern is the error message regarding a listener. There is no awareness of any connected listeners; the only connected element was the app registration, which has already been deleted.

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Answer 1

Navya 17,900 Microsoft External Staff

Hi @WaldemarL

Based on the error, you can't delete the custom extension until it is removed from the associated application. You may need to remove the association from the application first and then delete the extension.

The error message shows the application ID where the custom extension is currently associated. If the extension is linked to a deleted application, try restoring that application.

When did you delete the app registration? Deleted applications can typically be restored within 30 days. Once restored, remove the custom extension from the application, and then try deleting the Custom Authentication Extension.

For your reference: https://learn.microsoft.com/en-us/entra/identity-platform/howto-restore-app

Hope this helps. Do let us know if you any further queries.

If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let us know.

WaldemarL 20 Reputation points

2025-05-02T09:54:23.6866667+00:00

Thank you very much for the feedback! I've restored multiple recently deleted App Registrations and noticed that the connected Enterprise Applications had still a reference to the Custom Authentication Extension in the "Single sign-on" area. So deleting App Registrations incl. Enterprise Applications without deleting the Custom Authentication Extension Connection before makes the extension undeletable (forever?).

However restoring app registrations and deleting the connection in the enterprise application was the solution.
Navya 17,900 Reputation points Microsoft External Staff

2025-05-02T18:37:46.8+00:00

Hi @WaldemarL

I'm glad that your issue has been resolved. please don’t forget to click "Accept the answer" and "Up-Vote" for the same, which might be beneficial to other community members reading this thread. if you have any further query do let us know.

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Unable to delete Custom Authentication Extension in Enterprise Applications

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