Hi RegRea,
Thank you for posting in the Microsoft Community Forums.
Accessing cross-domain resources without being prompted for credentials typically requires some additional configuration. This usually involves authentication settings, permission configuration, and network settings. It's important to note that cross-domain authentication involves complex configurations and security considerations.
If you are certain about making modifications to your environment, I can provide guidance on the steps to take. However, because I'm not familiar with your specific environment and the previous domain might not be under your ownership, there may be some issues to consider. Therefore, if you're unsure about how to configure it correctly, it's essential to collaborate with your network administrator or security expert. They can assist you in reviewing and adjusting configurations to ensure the secure implementation of the required cross-domain access.
Best regards
Neuvi Jiang