A speedy reply to a dotster help request gave me a generic authorisation code to use (although it did say POST transition code!)
The code they gave me didn't work though, so I'm following up my support request.
(in the cases that "NA" does work, I assume it makes a difference if it is "NA", "na", "N/A" etc etc. I tired with the "NA" that stuff and Mr WebName gave.)
None of the exceptions Mr WebName stated apply, unless there is a dispute that I am unaware of. Domain is in "OK" status.
Unless of course it is a registrar foul-up. Probably most likely!