Cause information is not available.
The technology to run this application is currently available on the Latitude 7400 2-in-1 notebook:
Go to the Dell Support Site
Enter your service tag or express service code to get drivers specific to how your system shipped
Alternatively you can choose Latitude 7400 2-in-1 from the product list to get a general list of drivers for that system
Click on the Drivers and Downloads drawer in the menu
Ensure you have the correct operating system set
Select Applications from the category dropdown
Locate the Dell Proximity Sensor
Click on the download link
Once you double click on the install file - follow the onscreen instructions to update to this revision
Click on the Start Menu and type the keyword apps and select Apps & feature from the results
Type the keyword dell in the search bar and select Dell ExpressSign-in from the results
Click on Uninstall
Type the keyword intel in the search bar and select Intel(R) User Awareness Service from the results
Click on Uninstall
Reboot the system to have the changes take effect.
Here are some recommended articles related to this topic that might be of interest to you.