Odoo 15 - on-premise ubuntu 20.04

I'm trying to configure db_filter based on hostnames so we can run a dev and production database based on configured hostnames. With list_db = True we can connect via either url and select the corresponding databse and log in. But once we hide the Database Selector list_db= False. We get redirected to the Database Selector screen with the message that Database Manager has been disabled.

Is there something else I'm missing in the config to automatically just load the correct database based on the hostname in the url? I've tried the subdomain option and get the exact same behavior.