They asked questions over video and you had (I believe) two attempts to record your answers to them. If you pass this stage, they invite you to do a live interview over Zoom.
I applied online. I interviewed at Red Bull (New York, NY) in Jan 2018
Interview
A Series of questions and video calls that consisted of 3 rounds before you accepted a position to join the team. In depth and surface questions were asked throughout the process and then a training round
Interview questions [1]
Question 1
What was a challenge that you had to overcome at a previous job site.
It was an interview video, with pre- recorded questions. You had to record yourself and then submit it for review. The questions asked a lot about you and your values/ experiences. You should know why you want to be a redbull ambassador, and be passionate about it.