Still having the same problem on latest iOS 15.5 and not sure how to get around the issue.
ethanfan
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Are you able to figure out the issue. I am getting similar issue.
I like the idea. Check out Extended Runtime Sessions for Health Monitoring. It's not documented but mentioned in the WWDC video.
One problem I see is starting the microphone. For security and privacy reason I think you can only start microphone when app in foreground.
prioritizesVideoDevices = true