Why don’t I see my blood oxygen level in vitals?

I have an iPhone 16 Pro Max and Apple Watch 10. I have updated both to the latest OS so I can now view my blood oxygen level in the Health app on my iPhone. Yet when I go to the Vitals app I notice it does not show the blood oxygen level. Is there something I’m doing wrong or does the blood oxygen level not work in Vitals with this new change?