Samsung Health on an iPhone does not sync with Galaxy Watch. I get the error message in Samsung Health."no wearable devices connected". The watch connects and syncs with the phone, just not the S Health application.
THis has previously worked. Infact it was mostly reliable at the beginning, then slowly it has gotten worse. at first I would switch on and off Bluetooth and it would work then this work around became unusable and I would try al sorts of things like restoring my data. again these workrd for a day or so untill I started having to uninstall and reinstall Samsung health again this worked for a day or so but now nothing will get the samsung health application to sync.
We can't speculate compatibilities on a non-Samsung device. I would recommend reaching out to our Samsung Health team regarding this. They can be reached at 1-855-795-0509.