Inoperative key to stream music on bluetooth speakers (BT)

I wanted to use that key to listen to music on my PC via wireless speakers BT
Despite many attempts (install uninstall drivers, change the USB port, restart the detection of BT devices, enable disable BT, restart the PC etc ...) the sound never came out knowing that I tried on two BT speakers of different brands
Concretely the speakers are found and paired with the key but the sound continues to come out on the PC instead of going through the speakers: this key is of no use to me so I sent it back