I believe they refer to this section of the documentation : Core Help
Edge is not listed as supported browser.
In document Jive for Office/Outlook 30.5.0 - Office 2016 & Windows 10 support Edge is mentioned as supported.
But as this document is mainly talking about Jive for Office/Outlook I'm not sure where this support stands for.
When officially supported I would expect Edge to be listed in the Core Help.
Thanks for that. Hoping to get an official Jive response on this one, as we've been tracking it for some time, and there appears to be renewed interest amongst our employees for using Edge.
Here is my "unofficial" feedback : Edge does not support videos and we are curently facing slowness and freezes on IE11.