The Commvault user is unable to register an encrypted virtual machine during the restore process, despite having the recommended permissions as per documentation : Commvault - VMware Encryption for Virtual Machines
A virtual environment with encrypted virtual machines where Commvault is used to backup and restore virtual machines.
This may be due to insufficient cryptographic privileges that are specifically required for user to restore the encrypted virtual machines using Commvault.
For more information on assigning privileges in the vSphere UI, refer to Using vCenter Server Roles to Assign Privileges