New Luxe won't track my SpO2

[pocketspy]

My old Luxe (had to replace because the battery wouldn’t hold a charge) never had any trouble but my new one won’t track my blood oxygen level. It just stubbornly shows no reading. 
help!

Moderator Edit: Clarified subject

[Julia_G]

Hi, @pocketspy , how long have you been wearing your new Luxe?  It needs to be worn for a few days before it will register your SpO2.  I assume this is true even if it is a replacement for a previously worn Fitbit.

[MarreFitbit]

Hi there, @pocketspy. Thanks for stopping by in the Fitbit Community Forums and sharing the details about the issue with your Luxe. 

As @Julia_G has mentioned, if your Luxe is pretty new, give the heart rate a few days to settle down. It does some calculations, looking at heart rate throughout the day and while you are sleeping, so it might just not have enough data to give a reasonable value yet.

Nevertheless, please keep in mind the following:

• Your device doesn’t retroactively measure your SpO2 values. When you start using Fitbit SpO2, you’ll see dashed lines until after your next sleep session.
• You must get at least 3 hours of quality sleep. Data is only collected when you’re still. If you move a lot during your sleep or the sleep session is too short, you might not get SpO2 data.
• Charge your Fitbit device to make sure it’s able to collect data throughout your entire sleep session. Note that you may have to charge your Fitbit device more often when using an SpO2 clock face or app.
• You must sync your Fitbit device with the Fitbit app before the clock shows your SpO2 data. Note that it may take around an hour for your SpO2 values to appear after you sync your device. For troubleshooting syncing, see Why won't my Fitbit device sync?
• Turning off any SpO2 clock face or app permissions can cause the feature to stop functioning. For instructions on adjusting permissions, see How do I install and manage apps on my Fitbit device?
• Your Fitbit device must be able to consistently track your SpO2 data:
  • Wear your device slightly higher on your wrist.
  • Make sure your device is in contact with your skin.
  • Your device should be snug but not constricting.
  • Tattooed skin can impact the accuracy of the red and infrared sensors on your Fitbit device.