Starting with Chrome 69, you will be asked to "Allow" Flash each time you close the Chrome browser and join a Jigsaw session. The process is quite simple.
When you click "Join Session" the Chrome pop-up will alert you that stream.jigsawinteractive wants to run Flash.
The page will refresh and the Run Flash pop-up will go away.
Click "Join" Session.
The session window will open and from here "allow" Jigsaw access to your web cam and microphone.
Each time you close the Chrome browser and click "Join Session", Chrome is going to ask to you "Allow" Flash.