I do not own a Tacx.
This is your first try?
This is the first time you have experienced import problems?
When tou search this forum you will find other posts regarding Tacx.
For instance:
viewtopic.php?f=51&t=16548&hilit=tacxWhen I google for Tacx TCX import, I get many search results from people who all have import/export problems with Tacx TCX to Strava/Garmin/etc
Sometimes these people report problems with just HRMdata.
Others report problems with other data fields.
I can see many workarounds have been proposed.