So I found what I am assuming is a patreon code after paying, but the game doesn't recognize it.
The message is "You entered the wrong patron code"
Viewing post in School Game / Sandbox, Simulator, RPG comments
Write about this error in the discord channel of the game, and they will help you. I suppose you could have made a typo or done something wrong, which is why the patreon code is not recognized.
(All versions are being tested and not only you got it. However, this has surfaced a couple of times, and even those were due to the same typos.)