Has nothing to do with iOS.
On September 26th or so, my Move data stopped sync'ing to my Apple Health app. When i checked the Move settings in the Meta app, the option to toggle Apple Health was still there, but grayed out with the message that "Apple Health is currently unavailable." I've attached a picture. I put in a ticket with Meta and continually received instructions back on how to enable sync'ing to Apple Health.
A couple of days later, there was a Meta app update that I hoped fixed this issue, but instead I found that the toggle was removed entirely and under Connected Apps is nothing but blank space as shown in images from other people here.
I've submitted tickets and was eventually told to put in a Bug Report inside the headset so the engineers would see this. I don't think it's a bug though because it not only has been removed from the mobile app but if you go into the Headset, open the Move app and go to Settings, there is no ability to connect the Move data to anything anymore so the feature has been removed.
A real shame as I used this every single day and workout mostly in VR.