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Maybe try reboot phone and watch? If not, unpair/re-pair? Sorry. Mine work now.
 
What watch do you have? Is it the 6?
I was just wondering if it’s on the Series 5?
Right now I’m stuck in the beta 7.1, so I’ve set it aside until next beta.
Thanks in advance for your reply.

I have Apple Watch Series 5. Also,
even though on Apple Watch Store shows on my Series 5 that “Blood Oxygen” app is available, it is not available for Watch Series 5.
Also, with new beta updates, (9/28/20)my 11 Pro and Watch Series 5 are back to having new watch face update.
Best regards to all,
 
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