This is a four step process and people often miss a step.
You copy the system_settings.ini from Atmosphere/config_templates
Check to ensure that it says "dmnt_cheats_enabled_by_default = u8!0x0" and "dmnt_always_save_cheat_toggles = u8!0x0"
With either 0 to disable or 1 to enable by default...
New update drops and the Arch9SK7 pastebin full of the codes everyone should use daily is updated promptly. I have been using this thread since August 2020 and continue to be shocked by the dedication to keeping these codes alive.
Thank you @SkyQueen not just for keeping this thread going, but...
The problem is most likely your rom. Try downloading the rom again and make sure it hasn't been patched and says clean somewhere on the page. The anti piracy bypass feature negates the need for patching in most games and can cause conflicts.
Man we were gonna have a game night at my buddy's house but he wasn't feeling great so he canceled, which throws my dinner plans up into the air, so I guess it's time to order a pizza or something