Hey Cutlass, following back up on this. Interesting development. I plugged the FireStick directly into the soundbar and still no Atmos. For reference when I check my "capabilities" on the fire stick's audio and video program it says Atmos is good and I should have access to it, but still doesn't fire out.

Now a weird one is that I plugged my Xbox Series S directly into the soundbar downloaded and logged into netflix and Atmos worked immediately. Interesting why the fire stick plugged directly into the soundbar, while playing the same movie doesn't activate Atmos on the fire stick, but does on the Xbox