Here is a link to the full discussion regarding programming the Homelink, albeit for the Gallardo:

Homelink - Lamborghini Forum

At least on the Huracan, the indicators on the car WILL actually flash once you have successfully programmed the garage remote to the car's Homelink button, unlike the Gallardo, where the instructions state that the indicators will blink three times, but they actually don't, and you just have to trust that the remote has been programmed to the car.