I have Concept2 ErgData and Garmin Connect set up so that workouts recorded by Concept2 ErgData get recorded in Garmin Connect as well.
I did two workouts in one day that were recorded in Concept2 ErgData. One was recorded to Garmin Connect as well, as expected. The other did not get to Garmin Connect for some reason. Is there anything that needs to be done to get it there?