re: Who to Call .... Dolby Atmos Samsung-Denon

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I have front right, left and center speakers.
And then four in the ceiling, two forward and two to the rear. And a sub. Is this not good enough?

I've spent plenty time researching this but only recently found a note about having to use the HDMI cable. I know that I'm missing something that's why I called the Geek Squad.

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It is most likely those 4 in ceiling speakers are indeed atmos speakers but it sounds like you are missing your rear surround sound speakers. SO right now that setup would be a 3.1.4 and your AVR does not support that setup. You could try and hack a 5.1.2 setup and put the furthest back ceiling speakers as your surround speakers but ceiling speakers are terrible for that. You'd be better off adding your own surround speakers near ear level and using ceiling only as atmos.

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have front right, left and center speakers.
And then four in the ceiling, two forward and two to the rear. And a sub. Is this not good enough?

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You're good. You just need to make sure in the Denon menu that you're setup for 5 floor and 2 Height channels in the Speaker assign section. Set your Heights to Top Front. (That's probably what the Geek Squad did but double check)

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I've spent plenty time researching this but only recently found a note about having to use the HDMI cable.

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Optical cables don't support enough bandwidth for Dolby Atmos. You'll need HDMI. The easiest way is to connect all your devices directly to your Denon and then use the HDMI out to connect to your Samsung.

Also getting Dolby Atmos might require premium subscriptions if you're trying to stream movies. Netflix, Max, Peacock will all require their most expensive plans if you want Atmos. Hulu and Disney+ might not.

You'll also need to make sure your current streaming device also supports Dolby Atmos. If you have an older Fire Stick or Roku, you might need to update to the newer models.

If you're using a disc player, only Blu-ray and 4k Blu-ray will have Atmos or DTS:X mixes. DVD will not.