Monster energy grocery code invalid

After buying monster energy from the grocery store and Texting “Monster” to 47056 then uploading my receipt I Received a 8 digit code and the instructions with the code said to redeem it on halowaypoint/redeem, But when i put the code in it says it is invalid. is this a known problem ore is the code i was sent wrong?

Please post about trouble redeeming Monster codes here: https://www.halowaypoint.com/en-us/forums/8f4648981f554a9d86527a5754966e89/topics/monster-energy-code-not-working/bf88d05a-456c-4b93-a2c5-f4b05ff11431/posts