Apple music Dolby atmos

iMac 2017 model running 11.4

iPhone XR model running 14.6

Alright, that checks out.

New Apple Tv 4k model running 14.7 beta (to check i have installed this beta)

There is no support for public beta, but you should provide feedback on aspects that do not work. That is what beta is for.

I’m from India.

“Apple Music availability might vary by country or region.” [1]

I don’t know if all countries with Apple Music have this feature at this time. Such detail doesn’t seem to be publicly documented. Ask Apple Support for more details.

For Macs, are you on macOS 11.4? What is your model Mac?

For iPhone, are you on iOS 14.6? What is your model iPhone?

About spatial audio with Dolby Atmos in Apple Music - Apple Support

Please specify your Mac and its OS version.

Please specify your iPhone and its OS version.