The workouts from either a Stryd plan or a power-based plan in TrainingPeaks, FinalSurge, or 2PEAK will not show up in your Garmin Connect account. You can see the workouts in your PowerCenter account as well as in the Stryd app on your phone.
You will execute the workouts using the Stryd | Workout app and you can also see your next few upcoming training sessions with the Stryd | Workout app.
If you use the Stryd | Workout app, the data will transfer to Garmin Connect (and other platforms like Strava) after your run like it does when you use Stryd Zones.
Contact email@example.com if you have additional questions.