Currently the FR70 is not compatible with TrainingPeaks, but that does not mean you can't get the files into your TrainingPeaks account.
For each file that is missing Heart Rate Zones, please:
-Create an account (or log in) with Garmin Connect
-Download the activity files from the device into Garmin Connect
-Export the Files out of Garmin Connect as a .tcx file
-Upload the file through the QuickView or by dragging and dropping on the calendar
-Log into TrainigPeaks account and look at the newly uploaded file and check for Heart Rate Zones
Once you have uploaded the information, delete duplicates that do not show the Heart Rate Zones.