You are trying to install Acronis cyber protect Agent on a Domain Controller
Installation fails with the error "Fatal error during installation. Failed to get SID of group '....'"
Cause
Lack of user rights on the Domain Controller.
Solution
Create a new global admin user, e.g. "Acronis Domain Admin",
Assign the user the necessary rights as per the following article
Enable "unblock" for the installation file (right mouse click - properties)
Run the installation file as an Administrator
Choose the option "Customize installation settings" and specify the new Domain Admin user under "Logon account for the agent service" - "Use the following account".
Scenario 2
You are trying to install Acronis cyber protect Agent on a Domain Controller
Machine is a Secondary domain controller and a Primary domain controller exists in the environment
Installation fails with the error "Fatal error during installation. Failed to get SID of group '....'"
Cause
The security group 'Cyber Operators' was replicated from the Primary domain controller to the Secondary domain controller and it doesn't have the right IDs.
Solution
Remove the security group mentioned in the error message from the current machine where installation fails.
Re-run the installation file as an Administrator
A new group would be created with the installation.
More information
If the issue persists, follow these Microsoft articles to troubleshoot issues with setting up a secure session with a domain controller: