2020-08-07 16:35:52.7622 [ERROR ] 8320 [_5] Agent.AgentService: Failed to initialize Backup service: This access control list is not in canonical form and therefore cannot be modified.
Open the properties of the parent folder %programdata%\Veeam on the Veeam Backup & Replication server, switch to the Security tab, click Advanced and select the Replace permissions entries on all child objects with entries shown here that apply to child objects option.