I am restricted from screen sharing as host and as guest.

When I start a meeting as host, I've been intermittently getting a "screen sharing has been disabled" message. I'm intermittently unable to share in other people's meetings, as well. I've checked all of my settings to ensure that there isn't anything weird. Regardless, I wouldn't disable my own ability to screen share even if it was available.

Please note, this is NOT an issue with other participants. This is an issue where I, the HOST, cannot share in MY OWN meetings. I don't need instructions on how to check  sharing settings.