Server: MACOS 10.13.6
Client: Windows 10 Pro

UPDATED:

Solved that issue by removing switchDoubleTap = 250.

To clarify, the only issue I'm unable to get past now is getting hotkeys to work at all. None of them will do anything, seemingly no matter the config.

If anyone has some advice for how to approach this, please pipe in.

UPDATE:
Now have hotkeys working on client side only. All hotkeys on server side are ignored by Barrier.
Additional info:
All hotkeys using modifiers (CTRL, ALT, SHIFT etc) are ignored and do not register as an input in Barrier.
All single-key hotkeys (, E, 5 etc) are effective to change the active screen from client to server ONLY.

All other uses of hotkeys are ignored by Barrier.