Activating ThinOS converted devices requires the purchase of Wyse Management Suite Pro AND ThinOS activation licenses. If you are using Wyse Management Suite Standard, you immediately think you must buy WMS licenses for all your devices. The best way to do this is to purchase WMS Pro and ThinOS Activation Licenses for the number of devices you want to activate, creating a WMS Pro Cloud tenant with the licenses ready to assign.
All you have to do now is to register the devices to WMS Cloud using your default Group Policy Token, this will automatically assign a TAL to your device if is does not have one.
You can check the assignment by referencing the Subscription section in Portal Administration, if the device is assigned, unregister it and place it back in your WMS standard console.