From the help text
Redirect URIs
The URI to which Windows 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. Windows Azure AD will also check that the redirect URI your application supplies in the OAuth 2.0 request matches one of these registered values.
it stats that it do not need to be a physical endpoint but I have had no luck entering a valid urn endpoint
tried urn:myname:application
What are valid uris if its not urns and not a physical endpoint. ?
I think that's probably a documentation error. The RFC defines it as an Endpoint Uri (I interpret this to mean URL). It also suggests using TLS for the Endpoint Uri, which wouldn't make sense for a URN.
https://www.rfc-editor.org/rfc/rfc6749
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