Laravel Reverb on Cloudways

Has anybody successfully set up reverb on Cloudways?

I have tried all manner of configurations but nothing will work. Reverb will start on the designated port, which was opened up by Cloudways, but I immediately get a javascript error that the websocket connection has failed.

I am using:

REVERB_HOST=127.0.0.1
REVERB_PORT=3001
REVERB_SCHEME=https

VITE_REVERB_APP_KEY="${REVERB_APP_KEY}"
VITE_REVERB_HOST=[my domain]
VITE_REVERB_PORT=443
VITE_REVERB_SCHEME=https

I have tried:

• different hosts (0.0.0.0 and my server IP address)
• different ports (e.g., set reverb port to 443 and vite port to 3001, also, have them both be either 3001 or 443)
• Setting reverb scheme to http, as well as vite_reverb_scheme

I'm at a loss as to what to try next.