You installing architectural lighting for landscaping makes me think it's not you then. Must be something else....Here is a full proof method: Provided your AEs are connected with inverters, thake them directly to yours or a random, charged car battery. If they still don't lite up...it has got to be dead rings or inverters ...who installed your AEs?
I had bought mine like in the picture above and tested before baking the headlight. When all was done, one big ring was dead. So somewhere in the cooking proccess it got damaged or something melted. I then bought a spare ring and re-cooked the light and all was good. I bet it's your rings. I would buy a new set and test/swap the inverters first before opening the headlight. I know, it sucks...hang in!