You have subscription Sub1 and user Admin1 assigned the Desktop Virtualization Contributor role for Sub1. You need to ensure Admin1 can assign Scaling1 to Pool1. Solution: Assign the Azure Virtual Desktop service principal the Owner role for Sub1. Does this meet the goal?

Yes, this solution meets the goal. The Azure Virtual Desktop service principal requires the Owner role at the subscription level to assign a scaling plan to a host pool. This is because the service principal needs permissions to create and manage resources across the subscription that are related to the scaling plan's operations, such as starting and stopping VMs. While Admin1 has the Desktop Virtualization Contributor role, which grants permissions for many AVD-related tasks, it does not inherently grant the necessary permissions for the AVD service principal itself to perform the actions required for scaling plan assignments. Assigning the Owner role to the AVD service principal directly provides the broad permissions needed for it to manage resources on behalf of the scaling plan.