Fingers crossed @Butternutissquashed - my kid did it this academic year and we had a TOTAL tech fail. Nothing we or tech could do would solve it. They couldn't find any way round the problem, it simply wouldn't work, for no good reason - we tried everything. And we went from totally exam ready to trying different things with tech support every 5 days or so - to the point that when it was actually done, it was almost a month after first trying, so all the cramming wasn't fresh, and we weren't expecting it to work on the day it did!
Things that didn't help included: having to pay again (despite never getting to open the exam in the first place), being sent the fail result 4 weeks after we first applied of zero (surprise - surely you can expect that if the exam was never opened...?), and a lengthy fight over a refund for the first exam.
Like you, this was all topped off by a fail by one mark - something which perhaps may not have happened if their system had just worked! Did pass the second time though, an extra 5 marks - put some extra work against the lowest marked area and that did the trick.
Given the format of the exam, I really don't understand why it takes so long - I mean, they give you the driving theory test result on the spot...
Good luck for results second time around!