HEVC support for chromium edge

I try to play HEVC on canalia Edge(Ver 85.0.531.1).
But this movie file can not play.

I looked up how to play HEVC on Edge.

Then I found that I need to enable two flags:
1.PlayReady DRM for Windows 10
2.PlayReady Experimental HEVC Decoding

But the second flag(PlayReady Experimental HEVC Decoding)
does not show up in the Edge I'm using.

(I installed Microsoft.HEIFImageExtension and Microsoft.HEVCVideoExtension.)

Did Microsoft stop supporting HEVC?
What kind of things do you think could be the cause?