There isn't a UUID for Firepower licensing. You'll need to know what is your HW/Virtual model that you are trying to license, as well as what license do you need, and based on that, there will be relevant SKU.
You can find some information about Firepower ordering here.
Threat Defense licensing is exclusively a Smart license. As such, it registers with your customer portal after you have provided a smart license token to the device (via FMC for FMC-managed FTD devices or in FDM for locally-managed ones).