Really,
So now it is a real mystery.

I hope someone who knows will jump in to clarify things.

I was expecting it to work.
I checked it on 2 Windows 10 computers and it didn't (Asked for a Plug In).

Can you also share screen?
Could you try Disable the Flash Plug In and see if it still works?

Thank You.

Do you have Google Talk / Google Hangout Plug In pre installed?
Have a loog at the Plug In page in Opera.

But isn't it based on WebRTC and hence supported by Opera?

Hello,

Google Hangout works on Google Chrome with no need of any Plug In by using WebRTC.
Now, since Opera using Chromium engine, I was expecting Google Hangout to work on it out of the box.

Yet I tried it yesterday and it seems it requires Google Hangout Plug In in order to work.

Can it be fixed and we can have the same experience on Opera as well?

Thank You.