Failed to list tables. Not Authorized: User: arn:aws:iam::749068637630:user/cloud_user is not authorized to perform:
I have seen that the only two regions where you could create resources (when you use labs / playground) are us-east-1 and us-west-2. So for any additional region, (apart from the default us-east-1), you should use us-west-2 (Oregon).
Hope that helps