Due to a recent update from Google in the latest Chrome browser, version 71, Remote call participants using this browser version will experience that they cannot hear the presenter.
A workaround is for the call participants to use Safari or Firefox, or other Engager Remote compatible browsers.
You can find what Chrome version you're using by entering
chrome://version into the address bar.
Agnitio is looking into how we can accommodate these changes made by Google which is affecting a wide range of services who use browser audio.
We will keep you updated on our progress to support these changes.