Where is the headset on your ear? If it’s in the usual orientation, with the speaker pointing into the ear, you may not notice any difference. It needs to be resting on the aid itself, not your ear canal, and the speaker of the headphone needs to be pointing at a mic on the aid.
A ComPilot, Plantronics MDA 200, and Plantronics SSP 2714-01 Network adapter - USB - Bluetooth 92714-01 would likely be a better choice for doing what you want to do. It’s what I plan to do when I trial a pair of Phonak Brio aids starting tomorrow.