Explanation
The Set-IpamConfiguration cmdlet modifies the configuration for the computer that runs the IPAM server.
The -GpoPrefix<String> parameter specifies the unique Group Policy object (GPO) prefix name that IPAM uses to create the group policy objects. Use this parameter only when the value of the ProvisioningMethod parameter is set to Automatic.
References: https://technet.microsoft.com/en-us/library/jj590816.aspx