I didn't receive my Sleep Score

[N4t47i3]

I have a Fitbit charge 3 but the Fitbit application does not issue a sleep quality value, nor is there a calculation for SpO2. please give me a solution where the problem lies. thank you 

Moderator edit: subject for clarity 

[WilsonFitbit]

Hello @N4t47i3, welcome to the community forums! 

If you refer to the Sleep score, you must receive sleep stages to see a Sleep Score. Note that there are factors that could prevent receiving sleep stages, so please consider the following: 

1. If you slept in a position that prevented your device from getting a consistent heart-rate reading or wore it too loosely. For best results, wear your device higher on your wrist (about 2-3 finger widths above your wrist bone). The band should feel secure but not too tight.
2. If you used the Begin Sleep Now option in the Fitbit app (instead of simply wearing your device to bed). For more information on automatic sleep tracking, see How do I track my sleep with my Fitbit device?
3. If you slept for less than 3 hours.
4. If your device’s battery is critically low.

For more information, you can see: What should I know about Fitbit sleep stages?

For SpO2, this is only available for Fitbit Versa 3 and Sense. For details, please check: 

How do I track blood oxygen saturation (SpO2) with my Fitbit device?

Hope this helps!