Hello @guillaume de l'estang ,
Thanks for your query.
1.What's the OS version of your client computer and remote server?
Prerequisites for RemoteFX USB redirection:
A RemoteFX-capable client (Remote Desktop Connection 7.1 or later)
A virtual machine hosted on a RemoteFX host (Windows 7 SP1 or later)
Introducing Microsoft RemoteFX USB Redirection: Part 1 : https://techcommunity.microsoft.com/t5/security-compliance-and-identity/introducing-microsoft-remotefx-usb-redirection-part-1/ba-p/247035
2.USB audio devices. For these devices to function in the remote session when redirected by using RemoteFX USB redirection, the Remote Desktop Connection audio setting must be set to “Play on remote computer.”
Introducing Microsoft RemoteFX USB Redirection: Part 2 : https://techcommunity.microsoft.com/t5/security-compliance-and-identity/introducing-microsoft-remotefx-usb-redirection-part-2/ba-p/247060
3.USB audio device can only be used by the remote session while it is redirected. This mode is LAN-only. While high-level audio redirection is in use, USB audio redirection cannot be used, and vice-versa. To adjust the audio settings for a remote session, in Remote Desktop Connection, go to the Local Resources tab, and in the Remote audio section, click Settings. To use USB audio redirection: Set audio playback to Play on remote computer . On the Local Resources tab, in the Local devices and resources section, select the box to redirect the audio device over USB.
How can I verify that RemoteFX USB redirection was installed properly on the client?
In Device Manager, expand Universal Serial Bus controllers, and find any of the USB root hub, USB hub, or USB controller devices. Right-click the device, then click Properties . On the Driver tab, click Driver Details. If RemoteFX USB redirection is properly installed and enabled, tsusbflt.sys will appear in the list of driver files provided.
Introducing Microsoft RemoteFX USB Redirection: Part 3 : https://techcommunity.microsoft.com/t5/security-compliance-and-identity/introducing-microsoft-remotefx-usb-redirection-part-3/ba-p/247085
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