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Have a look at the Support document Which Workout Type in Garmin Connect Is Compatible With My Garmin Watch?
And did you really selected the type Running or Cycling at the workout you created? As far as I see the FR45 is not compatible with any other type.
I realize this is an old post Did you every get this fix.....i get the same thing.
Do you also have a Forerunner 45?
And what type of workout did you create?
Maybe Garmin patrols this site and would reply?
If you come here once in 10 months, then you would not see the answer anyway. You can also contact them directly at support.garmin.com. However, if you are trying to send any other type than a Running or a Cycling workout to your FR45, then it will not work, regardless whether you speak to Garmin or not.