I have a Pixel 3a and although I've updated the Samsung Health app it still not showing the O2 sensor widget at all. Even on my old Note 4 that I don't use anymore it dosen't show. Any suggestions?
I recommend that you call in and talk to our Samsung Health department 1-855-795-0509
It finally updated a couple of days after I posted this. It shows the sensor and it's working. I didn't have to call after all. Thank you.