My Apple Watch hasn't tracked my fitness/V02 max for about six months now. I've tried recalibrating and the supposed airplane mode fix and nothing has worked. Has anyone found a solution to this? Seems like Apple just shuts down the discussions of what appears to be a common issue.
Apple Watch Series 7, watchOS 11
Did you already try to erase the watch and pair it again as a new device to your iPhone, without using the latest watch backup?
Unpair and erase your Apple Watch - Apple Support
Then test the VO2max again, using the default Outdoor Walk, Outdoor Run or Outdoor Hiking workout.
Are you doing the types of workouts that measure it? Outdoor Walk, Outdoor Run or Outdoor Hiking workout. It's not measured during other workouts.
Apple Watch not tracking V02 max
