Events not published to Google Pub/Sub topic.

Problem : 

After configuring the external Google Pub/Sub topic in the tenant, events are not being published to the topic.

Cause : 

The issue arises because the service account has not been granted sufficient permissions. This lack of adequate permissions prevents the account from performing the necessary actions or accessing required resources. To resolve this problem, it is important to review and update the permissions associated with the service account, ensuring that it has the appropriate level of access to function correctly.

Solution : 

The service account should be granted the "roles/pubsub.publisher" role, which provides the necessary permissions to access the Pub/Sub topic. This role enables the service account to publish events directly to the topic, ensuring that it can send messages and trigger downstream processes effectively.