Activity won't sync with Garmin Coach Training plan

Hi.

I recently (today) started a Garmin coach 5km training plan programme.  Today's workout was a benchmark run, which I did.  I ran the workout on my watch (Fenix Pro 6) which worked fine.  At the end of the workout I did keep the clock running while I jogged back home.

At the end of the run I saved the activity, it has synced with Garmin Connect and shows there in my activities as "benchmark run".  However, it doesn't seem to have synced with the coached training plan which, as far as I can see, still thinks I haven't done the activity.

I have read that a potential problem could be was that the activity type is incorrect, labelled as "uncategorized", I have since changed this to "training" as suggested but still the training plan thinks that I haven't done the run.

  1. Why has this happened?  Did I do something wrong?  Was it because I kept the activity running once the workout was over?
  2. Is there a way to upload or get this activity into the coaching plan?  If so how do I do this?

Many thanks for any help