Could you go to https://connect.garmin.com/modern/report/-1/all/last_four_weeks, click on the link "Activity List", and verify whether the Tacx activity is really not there? My Tacx activities are listed there without any issues. Also double-check that you use the very same account for the Tacx Training app and for Garmin Connect.

1. The Tacx acitivites come through as an activity with all charts (hr, power, etc) but aren’t registering anything in training load.  See screenshot, several activities- bot nothing other than a short walk coming through into training effect.

Also my HRV status looks v different to yours.

If I go to my training load you can see the activities listed in the my activities posted earlier simply aren’t there