It's April 2020 and I have run into a similar problem on my Alienware R8.

I lost all Bluetooth functionality. The on-off switch in Windows 10, the icon from the system tray, and so on.

It was a hardware issue, stemming from the fact that I had opened up the case of the Aurora R8 to looky loo and blow out the dust. It was after that when I lost contact with anything to do with BT.

I think I somehow put the left side cover on slightly askew. Yes, I did close it up, but that is when my difficulty with all things BT began.

Today I removed the lid, swung out the power supply, and CAREfully put everything back together. My BT headphones immediately worked as usual.

This was after 45 minutes with a Dell hardware tech and 30 minutes with a Microsoft Windows guy.

Hope this saves someone a major hassle.