TBS Crossfire Bluetooth telemetry problem

I hit a snag sending telemetry through the TBS Crossfire LRS. QGroundControl refuses to connect via bluetooth to the Crossfire transmitter module throwing the following error

Hardware connection is in strict accordance with TBS Crossfire manual pg. 33; I have tried setting MAV_PROTO_VER to 1 and also unchecked “Only accept MAV’s with same protocol version” in QGroundControl, to no avail.