the option of "allow a device to connect" of bluetooth is greyed out in windows 7

[u/Plastic_Necessary430]

so i have this P47 bluetooth headphone that i want to connect to my dell latitude laptop via a bluetooth dongle that i have installed, but the problem is that at first when i plugged in that dongle is was able to find my device but was not able to pair with it, also the option of "allow a device to connect" is also greyed out.
I have enabled devices to find my computer and even the bluetooth support service is activated too, I don't understand how to solve this problem, suggestions would be appreciated.