Originally posted by Counterfeit
It may not be interpreting your browser's user agent as one that is internally listed as a 'modern' browser, which is understandable because the Edge stuff is fairly new.
The message does not care about the user agent. It uses feature detection
instead. Edge is based on a recent Chromium version, so I'm not sure why the site thinks it's outdated.
If you can type
into the browser's console
and show what it returns, it could help determine why it's misbehaving.