Hey Baron,
Are you using the latest version of the game?
I added these easier inputs for the cheats
Just press and hold all three keys at the same time:
Invulnerability: I N L
Big Bullets: B Y G
Big Head Mode: B I G
Max Resources: R S C
Max Hearts: H R T
Max Ammo: G U N
Herd Up: H U P
Herd Down: H D M
Max Gas: G A S
All Survivors: S U V
All Shards: O R B
If these cheets are the ones you're having trouble with, I've noticed some keyboards have trouble reading 3 keys at the same time.
to use the cheats all that is necessary is to have the player joined and active. Could you try a different Keyboard just to rule that out? I can send you a build with an easier method of inputing them if necessary,
Thanks for the support, Let me know if I can help,
Rafi