I tried downloading the wear and health aps first with no luck so I went ahead and installed the beta watch software. When completed, I was then able to access the beta Samsung Health app update but (so far) am continuing to get the same error you're getting.
I had the same issue and could download the health app, but not the Wear app. What worked for me was scrolling all the way down on the Health app, and selected "view beta apps" and then I was able to update the Wear app...hope this helps
Thank you very much for reporting the issue to us.
Please try the suggestions provided by other users. If the issue persists, please send us an error report.
We appreciate your contribution to the Beta community.
One UI Beta Team