Atmos issue with Tidal on Denon AVR-X4500H


Novice Member

i have a Tidal Hifi Plus plan with acces to MQA and Atmos tracks.
So i installed Tidal on an AppleTV 4K and connected it (HDMI) to the Denon avr-x4500h which is capable of Atmos.
The displays on the receiver changes to "Atmos" when i play an Atmos-track but it only plays in stereo, so weird.

I also have a Philips 65OLED855 TV which can pass Atmos over HDMI. Works like a charm with Netflix and Disney+. So i installed Tidal on the Philips.
The TV detects the Atmos content and the Atmos logo comes up when i play an Atmos track, then the displays on the receiver changes to "Atmos", so far so good but then again; it plays in stereo.

I have no problem with other Atmos content, Netflix, Disney+ and UHD disks all are played correctly by the Denon through my 5.1.4 setup.
Cant figure out whats going wrong.
Anyone got any idea what it might be?

Thanks in advance

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