Resource groups, subscriptions, and management groups limits

You can scale an Azure Virtual Desktop environment to over 10,000 sessions hosted per workspace.

It is advised that you consider the Azure Virtual Desktop control plane limitations during the initial design to limit any changes that may be required later:

• Microsoft recommends that you do not deploy 5,000+ VMs per Azure subscription per region. This recommendation is for both host pool types – personal and pooled – for a Windows 10 Enterprise single and multi-session deployment. It is suggested that most organizations will want to use Windows 10 multi-session, which allows multiple users to log on to a session host VM. You can increase the resources (compute and storage) of an individual session host VM to facilitate additional remote sessions.
• There are limits of circa 1,200 VMs per Azure subscription per region for automated session host scaling tools.
• You should create multiple Azure subscriptions...