I'd like an answer to this question too. It was working fine, then the other day sleep score suddenly appeared (Vivo luxe), I was happy about that because it wasnt previously a function on my watch. But then it all stopped connecting to connect. I can see the data on my watch, but it is not communicating the data to connect.
Really annoying. This was an expensive watch, and I'm regretting I didnt get another apple watch. THese forums don't help, I've spent hours searching and I just find a whole lot of people asking the same question and not fix (that works).
If the sleep is on the watch, and not syncing to the app, despite that the syncing itself works, there is typically a problem with multiple accounts messing up the data. It can be a duplicate phantom account that you are not aware of. Yo can find instructions how to fix it in theTroubleshooting guide for (some) data missing after syncing, namely the hint #4.
