To add a new session host virtual machine to an Azure Virtual Desktop (AVD) host pool, a registration token is required. The New-AzWvdRegistrationInfo PowerShell cmdlet generates this token for a specific host pool. This token is then used by the AVD agent during its installation on the virtual machine to securely register the machine with the AVD control plane. Generating this token is a prerequisite and therefore one of the first AVD-specific commands run in the deployment process for a new session host.

B. Get-AzApiManagementSsoToken: This cmdlet is part of the Azure API Management module and is used to generate a single sign-on (SSO) token, which is unrelated to AVD session host deployment.

C. Set-AzWvdADDomainExtension: This is not a valid or standard cmdlet in the Az.DesktopVirtualization PowerShell module. Active Directory settings are typically configured on the host pool itself, not as a first step for adding a host.

D. Update-AzWvdSessionHost: This cmdlet is used to modify the properties of an existing session host that is already registered in a host pool, such as setting its drain mode. It is not used for initial deployment.

1. Microsoft Learn

Official Documentation. New-AzWvdRegistrationInfo. This document describes the cmdlet used to create a registration token for a host pool

which is necessary for adding new session hosts.

Reference: New-AzWvdRegistrationInfo cmdlet syntax and description section.

2. Microsoft Learn

Official Documentation. Create a host pool with PowerShell or the Azure CLI. This guide outlines the end-to-end process. Step 2 explicitly details creating a registration token using New-AzWvdRegistrationInfo before creating the virtual machines that will become session hosts.

Reference: Section "Create a registration token".

3. Microsoft Learn

Official Documentation. Update-AzWvdSessionHost. This document confirms that the Update-AzWvdSessionHost cmdlet is for modifying an already-registered session host

not for initial deployment.

Reference: Update-AzWvdSessionHost cmdlet description and examples.