Question Listening Mode Not Available Onkyo TX-SR393

Aug 9, 2019
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When I try to push listening mode in the remote it says "Not Available". Why?

Here's my setup:

Input:
Chromecast (2nd gen) connected via HDMI to Receiver.

Speakers:
L, R, F

Streaming Apps used:
Netflix (DD+)
Amazon (DD+)
Youtube (PCM)

Thanks