I can run apps like Netflix, Amazon Prime Video etc. fine through DeX or screen mirroring, however when I open their websites via the AR Space browser lauching the media fails (logging into and browsing the sites is fine).
It looks like the browser starts to do something then nothing happens.
Unfortunately most of these services only run on either their own apps or on ‘whitelisted’ browsers like chrome or Firefox. NReal browser is not whitelisted.
I’ve been struggling with this for over a year and a half now 
the only option I found is to play Netflix on my PC with Firefox (the only browser that allows streaming), then stream my PC to the NReal browser.
Here’s hoping NReal becomes popular enough to get it’s own MR Netflix app like the Oculus Quest 