Connecting to Indoor Rower

Has anyone had any success using the Instinct 2 with a concept 2 rowing machine? I have followed the instructions given in support.garmin.com/.../ and my watch has successfully connected to the PM5 monitor (looking at the details of the connection on the watch correctly identifies the manufacturer as Concept2). However during a training session none of the relevant data, e.g. speed or distance is available on the watch screen, or in the eventual FIT file. I have no way of checking that the PM5 is broadcasting the data over Ant+, but it certainly is over bluetooth. I see from past forums there were similar problems with Fenix series, but these were eventually solved.