I have the full game of payday2 but I do have mods such as a pirate trainer for DLC’s, and wolf hud. I’m not sure if the trainer is making it not work but when I start the game the Play button doesn’t turn into a check and I cant enable any mods, is it because I have the trainer for DLC?
Try deactivating those mods and check, sometimes is possible to mod a game and use infinity, and sometimes not. Back in the days i tried a clean hud and tested it and it worked, but i didnt had any other mod.
also repost your question here: PAYDAY 2 Cheats and Trainer
so the mod maker can see your pain.