Hi hlysprt7,
Thanks for reaching out to Apple Support Communities. We understand you’re having issues setting up the Blood Oxygen app on your Apple Watch Series 6 and have some information and resources that may help!
Please open the Watch app on your paired companion iPhone. Scroll down and tap Blood Oxygen and then tap Enable. You’ll want to follow the prompts that appear to complete the setup process. You can read further details about this under “How to use the Blood Oxygen app” from this resource:
Measuring your blood oxygen levels with the Blood Oxygen app on Apple Watch Series 6
If you don’t see the Blood Oxygen feature in the Watch app on your iPhone, check the following:
Make sure you’re using an Apple Watch Series 6. You can use the steps here to identify which model you have:
Identify your Apple Watch
Make sure you’re not running a beta version of either iOS or watchOS. Go to Settings > General > About on both devices and view Version. If you’re running the beta of iOS 14.2 or watchOS 7.1 the Blood Oxygen feature will not be supported on your Apple Watch. The Seed release of iOS 14 also will not work, you will need to have the non-Seed, final release of iOS 14.0 to use Blood Oxygen at this time.
You can use the steps here to remove the beta iOS:
How to uninstall iOS beta software
If you’re on the watchOS beta, the Blood Oxygen feature will be enabled in a future release.
Thanks!