So I recently got a new Vizio tv and it supports Airplay 2 out of the box. I tested it out from my iphone and i was able to easily stream some video from my iphone. Nice. However it doesn't show up at all using either my 2015 nor my 2017 imac. All on the same wifi network of course and latest available OSx. I followed all the instructions I could find online including under preferences, displays, and checking the little box showing "show mirroring options in the menu bar when available". But the "airplay display" option is set to off and it doesn't give me an option to turn it on. Am I missing something to get that rocking? Thanks guys!