Here you need to add Pub/Sub Publisher permission to topic NEW_REVIEW. Here's how to fix it:

1. Go to the Google Cloud Console: Open the Google Cloud Console and navigate to your project that contains the Pub/Sub topic.

2. Find your Pub/Sub topic: Go to the Pub/Sub section and locate the topic projects/my-project/topics/gmb-reviews.

3. Edit permissions:

• Click on the topic to view its details.
• Find the "Permissions" tab.
• Click "Add Principle" to add a new member.

4. Add the service account:

• In the "New Principle" field, enter [email protected].

• Select the role "Pub/Sub Publisher" from the dropdown.

• Click "Save".

Now follow https://developers.google.com/my-business/reference/notifications/rest/v1/accounts/updateNotificationSetting