I bought the master chief collection and never received a Halo 3 ODST code with it i never knew i was suppose to get one with it until recently. Is there any way i could get one?
The ODST code was given to people who played MCC with a short period after launch. Your service record has your first achievement popping in june 2015 which would have been well after that period ended. I do believe that it can still be purchased live store though.