Cloud Builder cannot reach fileserver

[MarkusSchenardi]

I'm having the problem that the cloud builder seems not to be able to resolve the dns name of the created fileserver to get the created certificate.

Has anyone seen a similar error?

We're using a standard vnet with several subnets but have added domain services and 2 DNS servers to the vnet. Could this have an impact?

Error message from deployment:

{"code":"DeploymentFailed","message":"At least one resource deployment operation failed. Please list deployment operations for details. Please see https://aka.ms/DeployOperations for usage details.","details":[{"code":"VMExtensionProvisioningError","message":"VM has reported a failure when processing extension 'DSCConfiguration0'. Error message: \"DSC Configuration 'GISServerMultiTierConfiguration' completed with error(s). Following are the first few: Cannot convert argument \"0\", with value: \"System.Object[]\", for \"RemoveChild\" to type \"System.Xml.XmlNode\": \"Cannot convert the \"System.Object[]\" value of type \"System.Object[]\" to type \"System.Xml.XmlNode\".\" PowerShell DSC resource ArcGIS_Server failed to execute Set-TargetResource functionality with error message: CreateSite Failed. Error:- Failed to create the site. The configuration store location contains server configuration files that are being used by another site. Cannot find path '\\\\fss-LAI-PROD-00\\fileshare\\Certs\\SSLCertificateForServer.pfx' because it does not exist.\"\r\n\r\nMore information on troubleshooting is available at https://aka.ms/VMExtensionDSCWindowsTroubleshoot "}]}

[MarkusSchenardi]

This problem is the result of adding the DNS server to the vnet configuration instead of using the AZURE default DNS. When I remove the DNS entries it works. 

Question:

In the documentation I found the hint about an optional domain controller. But is the cloud builder using the domain controller if existing and adding the new servers to the domain?