HRV app does not vibrate when complete on my Venu 3 -- it did on the Venu 2, and it vibrates for other apps, just not HRV

I've enabled vibration, and it works for other Garmin apps - it just does not vibrate at the end of 2 minutes in the HRV test.   I can't find any other ways to enable or check it -- suggestions, or is this a known issue?