UCrewX5,
You were right, the wire for Microphone was tucked away on the driver side. I tried to feel under the headliner is there are any open wires, and I felt an insulation tape. BMW does not use insulation tapes for its wiring, so that raised red flags for me and when I flashed a torch there was the microphone connector taped to the rest of the wires.

So I managed to take the tape off and take the connector and connect the microphone.

Thanks for you help.