Streaming VUDU/Netflix/Prime Video/Play Movies in 4K?

Has anyone successfully convinced any of the major streaming services to provide 4K/UHD video to a RB15A with 4K OLED display? According to:

https://vudu.custhelp.com/app/answers/detail/a_id/407/~/how-do-i-watch-my-vudu-4k-uhd-movies-on-my-windows-10-device

I believe our beloved 4K laptops meet or exceed the requirements. I even installed the silly $0.99 HEVC plugin from Microsoft, but still VUDU only streams in "HDX". I've tried Netflix and Prime Video's UHD movies, but they all stream 1080p or lower.

As a data point, any of the 2160p/HDR on YouTube stream in 4K just fine, so I know the display, video card, and Chrome work with 4K/HDR. It's just convincing the evil streaming services that I'm a "legal" 4K display that's been the challenge.

Any hints, suggestions, or success stories are welcome and encouraged.

- Dave