The URI to which Microsoft Azure AD will redirect in response to an OAuth 2.0 request. The value does not need to be a physical ...

The URI to which Microsoft Azure AD will redirect in response to an OAuth 2.0 request. The value does not need to be a physical endpoint, but must be a valid URI.  Microsoft Azure AD will also check that the redirect URI your application supplies in the OAuth 2.0 request matches one of these registered values.