Apple Music Atmos only plays 2 channels through Blackhole 16 channel

[escapist1234]

Hi

I've had previous success routing 7.1.4 from Apple Music Atmos tracks to my DAW. However, recently it seems stuck to playing on channels 1 and 2. When using the test channel for channels 3-12 in speaker configuration, my DAW receives the test signal. I've tried multiple instances, reinstalling, but Apple Music will on send out a stereo pair when Atmos is playing. Has something changed (I had managed to capture 12 channels only a few months ago so it's very frustrating that I cannot work out what's causing it!)

Any help appreciated