Azure Active Directory > App Registrations > New Registration > Application ID URI field inquiry

Question

Before deleting an app I copied the Application ID URI field as a precaution. When I created a new registration I pasted the deleted apps' Application ID URI information into the new registration's Application ID URI field. I did this because the one that was automatically generated with the creation of the new registration did not look the same.

My concern is that this might be the wrong thing to do. I'd like to confirm this so that if I need to completely recreate the registration again without using information from the deleted app then I will do this.

This is in regards to the Mimecast-issued certificate being compromised.

Answer 1

Hello @Robert Araya , thank you for reaching out. The Application ID URI field is used to uniquely identify the scopes of your custom api and hence that entry has to be globally unique. You can either use the default value provided, which is in the form api://<application-client-id>, or specify a more readable URI like https://contoso.com/api.

If you have copied the App ID URI from some other App Registration, make sure it doesn't have any App ID mentioned in it as explained earlier. If the App ID URI name is unique in your tenant, surely that would work. But to keep things clean and green, I would always recommend going ahead with a fresh setup for the app registration, if that is a possibility on your end.

Hope this helps.

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