A: I've been in touch with Jip directly to solve this since his message, but if anyone else sees this and has the same problem, here's what has happened.

We shipped a big update to OpinionX at the start of June and the code redemption flow for Sumo-lings wasn't included because our campaign had already concluded on here. If you're like Jip and you've bought a code but haven't redeemed it yet, just email me at daniel(at)opinionx(dot)co and I can get you setup on your premium plan without any issues.