I think the proximity sensor in a laptop is typically responsible for detecting the presence of objects, often used to determine when the laptop lid is closed or when a user's hand is near the keyboard, which can trigger certain actions like turning off the display or adjusting the keyboard backlight or the proximity sensor in a laptop detects objects and actions, like closing the lid or proximity to the keyboard, to trigger functions such as display shutdown or keyboard backlight adjustment.   

You should check your device settings: Go to device settings and make sure the proximity sensor is enabled. You can usually find this option in the "Display" or "Sensors" settings.

We are beginning to see issues where a laptop cannot detect the Proximity equipment - has anyone had similar issues?

How to troubleshoot Cisco Proximity and ultrasound pairing

We have tried to disable "Audio enhancements" - but seems no luck?

One of the examples is a Latitude 7440 - anyone else?