In case it hasn't been stated yet, you are on a timer after the first monitor activation in the server farm area. You have roughly 10 seconds for the person to get onto the correct canister. It does take a few seconds to light up once you are on it though. If done in time, the monitor will reset the codes on the screens showing the second canister, and so on. If you don't get it in time the numbers will rapidly change to another 4-digit set then back to 0000 and the hold square/x icon will reappear. Don't worry though, you can do it as many times as you need to get it right. If your canister doesn't light up and make a sound after you have been standing on it for roughly that long, you will need to take everyone off of them and start over by activating one of the 2 server room monitors and get a new code. You only need one of the two at the monitors doing the activation. Took my team a little while to get it down to translate and hop on quick enough. Pulse and emblem are equipped on my Warlock if anyone wants a look.