Versa 4 won't track my heart rate nor calories burned accurately

[Bodyjammer-jo]

How demotivating! I do a very aerobic dance class a few times a week.  First day of Versa 4 I chose "dance" as exercise to log and I was continually below zones despite much effort, sweaty, red face, puffed out etc. Next class I chose "workout" like I would on my old Blaze.  It admitted that I was working at fat burn. It logs at least 100 calories less per class than Blaze though I know how much I am working. With Blaze I was always cardio with a good splash of peak. I want to go back to my old Blaze!  How hard must you work to register on the "dance" setting?

Moderator Edit: Clarified subject

[MarreFitbit]

Hi there, @Bodyjammer-jo. Thanks for stopping by in the Fitbit Community Forums and sharing the details about the issue with your Versa 4. I understand how you must be feeling.

Note that you might notice slight variations between your heart-rate reading on your new Fitbit devices compared with your old ones due to improvements in the heart rate sensor and algorithm.

Differences between heart-rate readings on your device and on exercise equipment are likely due to wrist or hand position. Make sure the back of your device is in contact with your wrist and that your band is snug.

Several factors can affect heart rate, including air temperature, stress level, alcohol or caffeine intake, immune response to illness, and medication use (source).

Exercising in cold weather can make it more difficult for your device to track your heart rate, as environmental conditions can affect skin perfusion (the amount of blood that flows through your skin). Spikes in your heart rate during sleep may be caused by sudden movements (for example, waking up and getting out of bed), or a weak signal due to wrist placement. 

As with all heart-rate tracking technology, accuracy is affected by personal physiology, device location on your arm, and type of movement. For a more accurate heart-rate reading:

• Wear your Fitbit device on top of your wrist, and make sure the back of the device is in contact with your skin.
• When you’re not exercising, wear your device a finger’s width above your wrist bone.
• During exercise, wear your device a bit tighter and higher for an improved fit. The band should be snug but not constricting (a tight band restricts blood flow, potentially affecting the heart-rate signal). Many exercises such as bike riding or weight lifting cause you to bend your wrist frequently, which could interfere with the heart-rate signal if the watch is lower on your wrist.

To resolve common issues, see our troubleshooting steps in What factors can affect my heart-rate reading on my Fitbit device?

[Bodyjammer-jo]

This does not answer my problem as my issue is far from a slight variation. We are talking 100 to 120 calories different between Blaze and Versa 4 for a similar workout. I know where to wear the Fitbit as I've been using one for years. None of the other factors are appropriate to me nor account for such a huge difference. If you think the Versa is right then the Blaze must have been one piece of junk. My plan now is to try a friend's Apple Watch to see what that says for the same workout.