I have completed this time trial multiple times but have not gotten the triumph for completing it. I have done it in less than 1 min 30 sec using arcstrider super to fly to the bottom. I have also used the platforms and completed the challenge in 2 min 25-30 sec. I have gone to orbit and remade the instance of the ascendant challenge each time so the time trial won't be bugged, so I have no idea why it is not working. I have completed the time trials for the last 2 weeks with no issues. I did record my last attempt if you want proof.