What must a Salesforce consultant do to resolve a callout issue indicated by an "Unauthorized endpoint" error?

To effectively resolve a callout issue that triggers an "Unauthorized endpoint" error, registering the URL in Remote Site Settings is key. This step is essential because Salesforce employs Remote Site Settings to specify which external services it is permitted to access. When you attempt to initiate a callout to an external URL not listed in the Remote Site Settings, Salesforce will respond with an "Unauthorized endpoint" error.

By adding the external service URL to these settings, you establish a trusted connection that allows Salesforce to communicate with that endpoint securely. This configuration is fundamental for ensuring that any API calls or integrations can function without facing authorization issues.

While creating a connected app, ensuring user permissions, and checking the callout method can all be relevant steps in other circumstances, they do not directly address the issue of endpoint authorization in this specific context. The immediate action needed to resolve the callout error revolves around updating the Remote Site Settings.