My brand new Fenix 5X doesn’t track my hear rate whilst doing any activity. Whilst not doing exceeds it shows my heart rate which is accurate. However, as soon as I do any activity it remains the same. For example I went for a run the other day and pushed myself quite hard. My heart rate remained at 70 BPM for the entire two hours and didn’t fluctuate at all. I’ve tried all the basic advice; restarting, updating, wearing tighter, wearing on the inside of my wrist etc etc but none have solved it. I’m more than happy to admit it is probably user error but can anyone point me in the right direction. Thanks