The device has two different types of bluetooth chips :
Try installing these drivers one by one please :
https://dl.dell.com/FOLDER08672366M/1/Killer-AX...
https://dl.dell.com/FOLDER07416190M/12/Qualcomm...
Depending on the device one of this will work.
Disclaimer: this is a non Microsoft website. The page appears to be providing accurate and safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (potentially unwanted products). Thoroughly research any product advertised on the site before you decide to download and install it