@David-TP 

Hi and thanks for your feedback.

Yes, I tried with different USB port and it did not work.

I tried to connect both my iphone and airpods, unfortunately I got the same results. In both cases my pc said that "We could not get any response from the device, please try again".

I dont know this information will help you but when I clicked to the connect button in my PC setting for my airpods, my airpods immediatly stopped its pairing mode and again I got the same answer from my PC as I said above.

  @David-TP 

Hi again,

I have an new information for you (I hope it will be usefull).

When I plug the TP-Link UB500, in the device manager, I can see the adapter in the Bluetooth section.

However I can not see the adapter in the network adapters section. When I plug the adapter only thing that pops up is "Bluetooth Device(Personal Area Network)". 

Is this normal?

  @FellowGamer 

Open the "Properties" of the "Bluetooth Device (Personal Area Network) ..." and it should show that it is linked to the TP-Link Bluetooth adapter.

By the way, did your computer previously have any other Bluetooth adapter installed or is the UB500 the first one?

  @woozle 

Hi, thank you for your feedback.

Yes, its says that "on TP-Link Bluetooht 5.0 USB Adapter".

Your second answer is also a yes, however as it said in the instructions on UB500, I deleted the previous device.  Now I have only 4 Bluetooth devices in my device manager. I am listing those below;

TP-Link Bluetooth 5.0 USB Adapter.

Microsoft Bluetooth LE Numarator.

Microsoft Bluetooth Numarator.

Bluetooth Device (RFCOMM Protocol TDI)

  @FellowGamer 

When you click "View" -> "Show hidden devices" in the Device Manager, are there any additional, light-colored items showing up under "Bluetooth"? If yes, then remove these as well and check whether this makes any difference.

In case nothing helps, then see if you can test your UB500 on another computer, just to make sure the UB500 itself is okay.

  @woozle hello, I have the same problem. my pc is new and I have tried everything. I have also tried to shut down wi-fi but did  not work. please help:)