A consent screen is required in order to create OAuth Client IDs, and an Authorized domain is required to set up the consent screen. As per this page regarding
OAuth Client Verification, Authorized domains “is a whitelist of domains containing information about your app. All your application's links (such as its required privacy policy page) must be hosted on authorized domains.” Keep in mind that you must first
verify your domain in order to be able to use it under Authorized domains.