The documentation notes that Xcode Cloud supports self hosted source control options and how to connect to one. However in an enterprise environment these are often accessible only through the internal network.
Is that something Xcode Cloud supports or is it only for source controls accessible publicly? If it's supported is there documentation how to configure that?
The IP addresses ranges that Xcode Cloud uses to talk to enterprise-hosted SCM providers is now in the Requirements documentation. Consult your network administrators to configure the network to support Xcode Cloud using those address ranges.