https://wccftech.com/macs-need-a-t2-security-chip-in-macos-big-sur-to-play-4k-hdr-netflix/

Apple introduced macOS Big Sur at its WWDC event this year. While the company has publicly released all other platforms, macOS Big Sur is yet to be made available to everyone. The update will bring major changes to how users see and use their Macs. For one, the company is bringing major design changes that resemble that of its mobile operating system. In terms of under the hood changes, macOS Big Sur introduces HDR video support for Netflix.

As mentioned earlier, macOS Big Sur will bring HDR video support to the Mac which will allow Netflix users to watch content in 4K HDR for the first time. However, all macOS Big Sur compatible Macs will not be getting the support as it was recently discovered. Only the models with a T2 Security chip will be able to stream Netflix in 4K HDR.