How do Roblox Promo Codes work?

Hello! I was wondering if you guys could help me since Roblox Support couldn't. How do Roblox Promo Codes work? Is there anything that I should do first in order to redeem them? I've tried many codes that were supposed to be for that month but when I tried putting them in in the middle of said month, the system said it was invalid. So I'm very confused. How do I get them and where? How long does it take them to expire? What platform would you recommend me to use so that I am able to keep up with them?

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