Can't set up Blood Oxygen on Series 7

I restarted the Watch and it asked to be paired with an iPhone again(!) This time it was really quick to set up, but I'm concerned it did this.

I also restarted the iPhone and, between the two, something has changed and I now see "Blood Oxygen Measurements" in Privacy on the watch. It's enabled but it doesn't get me anywhere because the other search result, "Blood Oxygen" still doesn't link to anything; tapping it does nothing.

What should I be seeing? How are you supposed to "set up Blood Oxygen" on the iPhone?

Thanks again.

I found a video and now I know that I should see "Blood Oxygen" in the list of installed apps in the iPhone's Apple Watch app. It's not there. The app is on the watch, but not visible in the iPhone app.

I've restarted both devices. Any suggestions?

Thanks for the reply. I've made some progress. My Apple Watch series 3 was still paired to the iPhone and this seems to have been restricting the Apple Watch app from showing the Blood Oxygen app. I haven't unpaired the series 3, but shutting it down seems to have fixed that problem and I now see the Blood Oxygen app and, when I open it, I see "Blood Oxygen Measurements", which is enabled.

However, when I tap the Blood Oxygen app on the watch, I still get "To set up Blood Oxygen, open the Apple Watch app on your iPhone".

I followed your link. In the Health app, where it says "tap the Browse tab, then tap Respiratory > Blood Oxygen > Enable", I only get as far far as Respiratory. On the Respiratory page, "Blood Oxygen" is in a section down the bottom headed "No Data Available" and when I tap it, it takes me to a calendar headed "No Data".

Thanks again, but I'm still stuck.

It was your last suggestion, un-pair and re-pair, that got me there. It's a bit of a PITA and I suspected it would do nothing, but it not only fixed this problem, but another, unrelated one. Thanks for your help.