Multiple instance broadcast shortcut not working

Open RDM instance and open sessions. set broadcast on/off shortcut keyboard.
shortcut works.

Open a 2nd instance of RDM and open sessions. keyboard shortcuts do not work in this instance.

Open a 3rd instance of RDM and open sessions. keyboard shortcuts do not work in this instance either.

Keyboard shortcuts continue to work in the 1st/original instance only.

Workaround is manually turn on/off broadcast in each sessions within additional instances.