found the reason why it wont work

[somerandomguy404]

so in the code he has made the bot create codes with 23 character length you have to change the code to 19 bc thats how many characters the nitro code is its humane to make mistakes

[Neatcher]

what does it mean? where?

[maozdemir]

https://github.com/logicguy1/Discord-Nitro-Generator-and-Checker/blob/e2464589be660fb8dc7ac2c503718de98c0b051f/main.py#L114

The generated code is 16 characters long, which aligns with Discord's pattern.

[Supergamerrr]

You must use proxies.