@Sulfate Welcome to the Fitbit Community! It's great to have you here! Sorry to hear that your tracker isn't detecting your activities. Your tracker detect activities based on the motion on your arm. For example when using the elliptical machine make sure you have the moving bars so your tracker detects the motion and record the activity itself, once an Elliptical activity is saved on your account it should show on the Recent Exercise area. If your heart rate is high but there isn't much motion (yoga, weight lifting, etc.) then these activities will be difficult to be detected by your tracker. Still you can manually log your activity so you have a record on your account or use the activity mode on the device itself.
Let me know how it goes!
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