Apparently this was never released on Quest 3. However, I’ve just found out that the fastboot command “oem set-sensorlock 1” enables Sensor Lock, and it works, even if your headset isn’t unlocked!
With Sensor Lock, even if malware compromises the Android kernel once the Privacy LED turns off the cameras and microphones are electrically disconnected until the power button is pressed. Proud to be shipping this to our customers. On by default on the Quest 3S.
@Heaney555 They're extraordinary circumstances where the system fails safe. Like if an OTA update fails to apply or a kernel panic reboot happens while you're wearing the HMD. These will direct you to press the power button again before sensors become available to the rest of the system.