Hi @jsebast1245, the validation environment is the canary ring and new Windows Virtual Desktop features like e.g. MSIX App Attach is enabled here first.
With canary deployments, we deploy a new function set or code in a small part of the production infrastructure. Once the function is signed off for release, only a few users are routed to it. This minimizes any impact.
For your personal internal tests you can use a separate host pool. But new service feature will be available in the validation environment first.