I lost the free ODST code because it expired before i got to see the message?

Hey there! I've sent you a Forums Private Message. You can check those by clicking
HERE. =)

Are you talking about the Game Pass promo where you had to play Halo MCC and then received ODST dlc as the reward? I don't believe the code was for ODST directly and more like a $5 gift card code that you could get ODST after. These codes do expire so
I'm not sure when the expiration date/time but you should double check your messages on xbox or even Xbox app on mobile to see if you could still redeem the code.

I received my code for ODST / free month of XBL, but I accidentally deleted the message / the message expired, what can I do?

• If you make a post over in this Xbox Support forum, someone there will be able to help you out
  
• For information: Xbox Live messages auto expire after 30 days. If you ever receive a code via one of these messages, make sure to either write it down or store it somewhere like a SMS message or a secure paste bin.
  

I got this from the Waypoint forums. All you need to do is contact Xbox support on the forum and they can help out.

Same here. My Halo 3: ODST campaign download code has expired. I would like to get the Halo 3: ODST Campaign download code. I couldn't download it at the time and it ran out before I could redeem it.

I missed the Limbo message before the message expired as well.

I also missed redeeming the free 1 month code for early adopting the Master Chief Collection before the message expired.

Can you help Miss Diggz? Or is there anything I can do?