Hello, I have been following this thread waiting for a solution as well.
I have 3 Windows 11 pc's. I have tried the uninstall, reboot, reinstall method several times. I have cleared cookies and the registry using ccleaner on all 3 pc's between restarts. I have attempted the beta installation on this thread on the main PC with an older version on my 2 secondary pc's. Still no joy.
From either of the secondary PC's, I'm broadcasting mouse clicks and scrolling on the primary pc simultaneously. The secondary PC's seem to be working properly. I am not running any other apps or programs in the background. I am playing in fullscreen on all the pc's, but even if I put the primary pc in windowed mode and move the EQ window away from the side of the monitor I'm mousing over to the other PC's, it still controls the EQ character.
When I log out of EQ on the main PC, but my secondary pc's stay in EQ, the broadcasting to the primary PC stops. It is only when the primary pc is in game. I play EQ through the launcher. I have noticed this behavior when I'm playing Elden Ring (through Steam), my primary PC will duplicate mouse actions on a secondary pc that I'm using to surf the web/ look things up.
Keyboard actions are not duplicated at all, it's just the mouse left, right buttons, and the scroll.