I tried using SimBrief integration through the FMS/ACARS menu yesterday and all I got was a quick flash on the FMC display. I did update the iniManager to the latest version (don't recall the number). I assume there has been no resolution to this yet and I accept it for what it is. At the same time, it is rather disheartening to see others just click-n-go on their videos and/or streams and I can't even load a flightplan thru the iniManager let alone the FMS integration.
Trying to stay positive, I hope there is able to be a resolution soon; however, I also realize in this world there are much bigger fish to fry in the meantime.