I recently upgraded my system to a 4.1.2 and ran Dirac. I have an Xbox that outputs atmos and gaming works perfectly and the receiver displays that it outputs "Atmos". However, when streaming movies from HBO Max (now just max) that's dolby atmos, I am unable to change the settings to output atmos and it only displays "DSur" and other generic ones but not Atmos. I have tried other movie streams as well such as casting using bubbleupnp on to my TV. What am I doing wrong to not get the Atmos output?

Note: Prior to my upgrade, I had a 2.1.2 setup also corrected with Dirac and the same movie streams and games were outputting atmos as it confirms on the display as "2.1.2 Atmos". I was expecting to see it say "4.1.2 atmos" after the upgrade. Is there a difference between the two?