This just flat out doesn't work in my browser (Chromium). I even disabled the adblocker to see if that helped. It's telling me I chose "Deny" when I was never given an option. A pop up that doesn't work?
For some reason linux machines have their global flash setting with peer assist defaulted to "deny" on all sites. To fix this go here http://www.macromedia.com/support/documentation/en/flashplay... and enable peer assist for meetings.io. This should solve it.
That flash applet showed "Always ask" for "oi.meetins.io". I changed it to "Always allow" but it does not seem to make a difference.
I have the same problem, I'm using Chrome. It might be related to linux.