Similar problem. I'm trying to get magnetometer data on Apple Watch 6 or 7 but isMagnetometerAvailable returns false. At the same time, the app for logging sensor data (SensorLog) can record magnetometer on the watch in some way.

Did you come up with some solution? I'm also trying to get magnetometer data on AppleWatch 6 and 7 but isMagnetometerAvailable is false. However, an app for collecting sensor data " SensorLog " can access it.

I've also had this question and after contacting Code Level Support got the answer. Reference frame should be used to get magnetometer data. For example: self.motionManager.startDeviceMotionUpdates(using: CoreMotion.CMAttitudeReferenceFrame.xMagneticNorthZVertical, to: .main) { (deviceMotionData, error) in    guard error == nil else {          print(error!)         return     }     if let motionData = deviceMotionData {          let x = motionData.magneticField.field.x          let y = motionData.magneticField.field.y          let z = motionData.magneticField.field.z          let h = motionData.heading          print(x, y, z)          print(h )          print(motionData.magneticField.accuracy.rawValue )     } }

+1 with the same issue, only on WatchOS. On iOS it works correctly.

Are there any suggestions for workaround for this issue? Like deactivating session before requesting microphone permission?