It's better to use bluetooth fake location app to unlock ALL functions.
For the details, see the comments below, like https://gist.github.com/imReker/fba069c6cae7407509863b0ed78da2a7?permalink_comment_id=5889305#gistcomment-5889305
After a lot of testing by the people in the comments, it looks like only ECG will work.
So just replace the first three files:
com.apple.HeartRate.notifications.plist
com.apple.HeartRate.plist
com.apple.private.health.feature-availability.plist
Hi, the same thing is happening to me, but I'm using iOS 26 and watchOS 26. My watch is a Series 10. I don't think it's a problem with yours.