Do you have double checked the key? YOu should register here https://www.buddyauth.com/ with the e-mail you used for buying hearthbuddy. then you can see your keys and the status. copy it from there
I've already checked the key multiple times, for some reason after the update it changed to honorbuddy edit// sorry, i fucked up. I apparently purchased a key for honorbuddy a while ago and it completely slipped my mind. and I've been trying to use that key for HearthBuddy, However, would it be possible to change the key for this to a HearthBuddy key? ;-;