Web Messaging Guest API: Setting authenticated user attributes fails with 403

NICE CXone API & Integrations
1

Trying to push authenticated user attributes to the Web Messaging widget via the Guest API before initializing the chat. The widget loads fine for anonymous users, but when I try to attach user_id and email via the pre-chat form, the connection drops immediately with a 403 Forbidden error.

  • Using genesyscloud-webmessaging SDK v1.12.0
  • Passing attributes via setGuestAttributes in the configuration object
  • Verified the OAuth token has webmessaging:guest:write scope
  • Payload looks like { user_id: "abc123", email: "test@example.com" }

Here’s the config snippet:

const config = {
 organizationId: 'org-id',
 widgetId: 'widget-id',
 guestAttributes: {
 user_id: 'abc123',
 email: 'test@example.com'
 }
};

The docs imply this should work, but the network tab shows the POST to /api/v2/conversations/messaging/guests returning 403. Am I missing a header or is the scope wrong?