I've branched this discussion to a new thread, since it wasn't related to the audio output selection thread that you posted in. Everyone in that thread gets an email notification whenever there's activity, and we don't want to spam them with unrelated stuff.
If you've followed the instructions on enabling Flash Player in Edge, and the specific content that you care about doesn't work, then your easiest option is probably going to be to use another browser. These are restrictions imposed by the browser, not Flash, so we don't really have any control over them.
For completeness, here's the guide for enabling Flash Player in Edge: