What RDP property must be configured to allow Azure AD-joined users to sign in to session hosts?

The requirement to configure the RDP property to allow Azure AD-joined users to sign in to session hosts directly relates to the property that specifies if the session hosts should accept authentication from Azure AD accounts. The property indicating this capability is "targetisaadjoined:i:1".

When this property is set to 1, it tells the Remote Desktop Protocol (RDP) to facilitate the connection for users who are authenticated via Azure Active Directory (Azure AD). This is crucial in environments where organizations have moved to Azure AD and want their users to leverage those credentials when accessing virtual machines or session hosts in Azure Virtual Desktop.

By enabling this property, you create a seamless experience for users, allowing them to use their Azure AD credentials to connect without encountering barriers or needing to configure alternative authentication methods. This direct integration with Azure AD is key to maintaining a streamlined and secure authentication process in the Azure Virtual Desktop infrastructure.