> Ultimately, do we want zero communications between this UAC 
> and UAS (because the UAC can always get a 480 without 
> additional information letting it know what was really wrong 
> with the request), or do we want to send the UAC something it 
> can understand about this scenario?

Yes, we want the default to be a "hard failure" that looks like if the
target was not corrently registered.

That's the reasoning behind the 480.


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