All of that sounds simple in hindsight, but I spend days trying every combination of stuff, and even was hooked up through an HD Fury Arcana for a short time. This method gets the audio perfect, highest quality ATMOS, and synced up about 98% as nicely as the Arcana does.
Nicely done. I have an older Samsung with only 2 HDMI inputs, 1 of which is eARC. I remember it taking me a while to figure it all out (sonos & xbox series X) , and even had the Arcana as well until I got it to work without it.
This guide was perfect. I have a QN90B and followed this guide and it works flawlessly. The QN90B has four HDMI 2.1 ports with one of those an eARC port. Series X is plugged into HDMI 1 and Sonos Arc is plugged into HDMI 3 (eARC). Used your settings and enabled Atmos through the Dolby App on the Xbox. Perfect sync, no delay.
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