TDS Only Lists One RSWA Device
Since version 4.0.0, the Device Manager feature was released, which allows you to register RSWA devices with your TDS server. However, it might appear in some instances that only a single RSWA device can be registered with TDS.
One possible solution to this is to regenerate an RSWA device's UID. In cases where a single Windows Image was rolled out to multiple RSWA devices, these RSWA devices are now exact clones. This is why TDS cannot properly distinguish different RSWA devices because they all operate with the same identifier.
The UID of an RSWA device can be regenerated on the device itself by clicking on Settings -> System Information -> View License Details then Refresh Device Identifier.
The device has to be reregistered to TDS if it was registered beforehand.