if this is the case, it would be great to change the app so that it clearly says this to the Galaxy Watch 4 user.
I have been wondering for days what settings are wrong. Sideloaded the beta APK, sideloaded wear version 5.5, turned continuous monitoring off/on, allowed background activity, restarted phone, restarted watch, etc pp.
The SAA UI makes it seem everything would work for SPO2 just like it works for the heart rate.
If the app cannot read SPO2 then it would good if the app would say so.