Hi,
I've recently encountered an issue with an application user I created to use the server to server authentication (detailed here). The application user itself worked fine, but I encountered an issue when I wanted to disable the account.
The Application Registration that was created in Azure AD for the user has been deleted. Due to this any attempts to modify the Application User now result in an error message of "Azure application ID not found". I do not seem to be able to take any actions involving this user anymore. I attempted to update the Application ID value to the value of a new application I registered in AD, but the same error occurred.
We didn’t find that application ID xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx in your Azure Active Directory (Azure AD). Make sure your application is registered in Azure AD.
I don't know of a way (if there is one) to re-register the application with the exact same ID as before. Is there anyway to resolve this issue?