I can't delete a native App Registration in Azure AD portal

Question

I just want to delete an AD app registration that I create for testing purpose. I can\'t delete it because the delete button is grayed out. Before I deleted another not used app

Answer 1

In my case I was not able to delete via Azure app registrations, but when switched to App Registrations (Preview), delete button was active. As this is ever changing cloud environment, answers change over time

Azure portal screenshot: