How to play an A#Maj7/9 chord on Accordion

AKA: A#j7/9, A#M7/9, A#M9, A#Ma7/9, A#Maj7/9, A#maj9, A# major7/9, A#Δ7/9, A#Δ9

Notes:

A#, Cx, E#, Gx, B#
(A#, D, F, A, C)

Intervals:

R, 3°, 5°, 7°, 9°

Left hand:

Enharmonic B♭ + B♭M + FM

Fingering:

4 + 3 + 2