The greatest concern to the auditor should be that the customer cannot monitor its cloud subscription on its own and must rely on the provider for monitoring purposes. This situation can lead to a lack of transparency and control over the security and compliance posture of the cloud services being used. It is crucial for customers to have the ability to independently monitor their systems to ensure that they are secure and compliant with relevant regulations and standards.
References = This concern is highlighted in the Cloud Security Alliance's (CSA) Cloud Controls Matrix (CCM) and the Certificate of Cloud Auditing Knowledge (CCAK) materials, which emphasize the importance of continuous monitoring and the customer's ability to audit and ensure the security of their cloud services1.