Since the dealer couldn't do anything over the phone, I schlepped over there again (in the pissing rain) and, lo and behold, MyRide starts without a hitch and Navigation suddenly finds itself available.
Dealer couldn't work out how to get nav instructions on the dash, nor can I - any ideas?
Navigation on the app works fine, phone sees the dash and the dash sees the phone, but no turn indications on the dash. Someone must have done it.