Creating Keybinds in Discord with Voiceover?

Hi all,
I'm not sure if anybody has had any success with this, but I can't for the life of me figure it out. I want to create a keybind in Discord to disconnect from voice channels/calls without having to find the disconnect button. You can create a keybind to do this, but voiceover doesn't seem to actualy let you.
After pressing Command comma for Discord preferences, then navigating to keybinds>add new keybind, I am unable to set the keybind. I can choose the action, disconnect from voice channel, but once I press the record keybind button, I can't get the key combination I choose to actually stick. I've tried any number of different key combinations, so it can't be the keys I'm choosing for the bind.
If anybody has successfuly created a keybind, and could give me some pointers, I would be most appreciative.
Thanks in advance!