Hi! ,Aaron Ford1
Welcome to the Microsoft Community!
I have realized that you don't confirm which version of the bluetooth driver should to download and whether you should reinstall windows 10 in your refurbished Dell XPS 9550.
I want to confirm that the specific model of laptop is Dell XPS 15 9550?This laptop was released in 2015 and it is currently discontinued.
The result of my query is that “The Microsoft requirements for Windows 11 are not supported on this device“
here is the official website:Support for XPS 15 9550 | Drivers & Downloads | Dell US.
I found that Dell XPS 15 9550's Bluetooth driver is only supported on Windows 10,you may try to contact Dell Technical Support to
confirm whether they can provide a Bluetooth driver that is compatible with your laptop.
Here is the link:Contact Us & Dell Chat | Dell USA.
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 PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
Thank you for your understanding and patience and I look forward to hearing from you.
Ryan - MSFT | Microsoft Community Support Specialist