You can change the display name for a remote desktop for your users by setting its session host friendly name. By default, the session host friendly name is empty, so users only see the app name. You can set the session host friendly name using REST API.
To add or change a session host's friendly name, use the Session Host - Update REST API and update the properties.friendlyName parameter with a REST API request.
Reference document for more details : Customize the feed for Azure Virtual Desktop users
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