Which action cannot be performed in application owner metadata certifications?

In the context of application owner metadata certifications, the specific action that cannot be performed is reassigning certifications. This action typically involves transferring the certification responsibility or task from one individual to another. However, in the framework of metadata certifications, the application owner is generally expected to perform the review and certification tasks directly, as it involves assessing access rights and ensuring compliance with organizational policies.

The other actions listed—rejecting, decommissioning, and certifying—are standard tasks in the certification process. Rejecting means determining that an entity does not meet compliance or access standards. Decommissioning relates to formally removing or retiring an application from the certification process if it is no longer active or needed. Certifying is the main objective of the process, which involves confirming that access rights or metadata configurations are appropriate and compliant. Thus, reassigning would not align with the direct accountability placed on the application owner to certify metadata.