In order to use VEEAM backup solutions, certain privileges are required to be enabled for CloudAdmin or AD user. These privileges include:
Addition of these privileges leads to lack of permission error. Backup of the migrated servers are blocked. Error message "Not eough privileges to execute this action".
Addition of privileges to CloudAdmin user is not supported or possible at this time.
The maximum privilege allowed in a VMC environment already resides with CloudAdmin user and therefore no further privilege can be added to it. There is a VEEAM document already for VMC environments including limitations, which can be found here:
Refer Veam Article VMware Cloud on AWS - Support, Considerations and Limitations for Veeam Backup and Recovery
This is the full list of Cloudadmin privileges which cannot be exceeded for any other role: Cloudadmin Privileges