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The passage quoted below is taken from an article previously posted on this site. Is what it says still true in WatchOS 5? If so, my two Apple Watches don’t indicate any Sync in the Activity app, though the syncing may be occurring and in fact stored in the Health app. Both iPhones are signed into the same AppleID.
“Okay, so this isn't really using the same Apple Watch with multiple iPhone models, but it's close. Thanks to the way Apple's Health infrastructure works, any device that's synced with your Apple ID can back up encrypted workout data to iCloud; as such, you can wear Apple Watch #1 (tied to iPhone #1 ) for your morning workout, and Apple Watch #2 (tied to iPhone #2 ) to your evening workout, and the Health app will record both and combine all records that evening”