Why doesn't AAC 7.1 direct play on any of my devices?

Plex Media Server Desktops & Laptops
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Hi all,

I have a Roku Ultra and PS4 connected to my soundbar and then soundbar through to my TV; all via HDMI no ARC.

AAC mono, AAC 2.0, and AAC 5.1 all direct play fine and the soundbar reports each stream coming through as “LPCM”.

The problem is that AAC 6.1 or 7.1 tracks are always transcoded to eAC3 7.1 and I don’t understand why. Plex reports “max of 6 channels exceeded for codec ‘AAC’”.

My soundbar supposedly supports PCM 2.0, 5.1, and 7.1 channels (link below) so why does Plex need to transcode and use CPU?

Sony Soundbar HTCT780 Specs

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