403 Forbidden Error When Accessing Flows and Prebuild Options in GCP Conversational Agents

It sounds like you might be hitting an issue with the region configuration for Dialogflow CX features. The flows (and prebuilt components) are part of Dialogflow CX, which requires you to create your agent in one of the supported regions (for example, us-central1) rather than the global region. In contrast, Dialogflow ES uses a global endpoint and isn’t structured with flows.

Here are a few steps to troubleshoot and resolve the problem:

1. Check Agent Type & Region
   • Confirm that your agent is a Dialogflow CX agent.
   • If it is, ensure that you created it in one of the supported regions (like us-central1) instead of the global region.
   • If you’re mistakenly using a global region (suitable for ES) with CX features, adjusting the region should help.

2. Review IAM & Permissions
   • Verify that your account has the correct permissions (for example, roles like Dialogflow CX Admin or Editor) to access and manage CX resources.
   • Although you mentioned you’ve granted API access for Dialogflow, double-check that the same holds for the CX API if it’s separate.

3. API Enablement
   • Ensure that the Dialogflow CX API is enabled in your project. Sometimes having the ES API enabled isn’t enough when you’re working with CX features.

4. Console Cache/Bug
   • On rare occasions, you might be seeing a temporary issue with the Cloud Console. Clearing your cache or trying a different browser can also help rule out client-side problems.

Switching to a supported region for your CX agent should eliminate the 403 forbidden error when accessing flows and prebuilt models.

If after trying these steps you still encounter the error, consider reaching out to GCP support, as there might be specific account or project-level settings affecting access.

Hope this helps!