Just a suggestion…
I think it would be simpler for everyone if Epic just reviewed who completed the challenge during the contest, and awarded them. I doubt many, if any, did all the lessons during that period that wasn’t doing the challenge? The extra registration made a headache for everyone.
In my case, it seems like registration bugged out.
Like why would I do all the lessons without registering? Websites mess up all the time.
I was mostly just hoping for a t-shirt 
I’d buy one if I could.