Fixed it, go here for Halo reach code.
http://expertzone.microsoft.com/halo.aspx
I took the ODST quiz and went there, they said my code should be in my inbox shortly.
Edit (Email):
Dear Jason,
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YOUR HALO: REACH BETA CODE
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XXXXX-XXXXX-XXXXX-XXXXX-XXXX
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DOWNLOAD INSTRUCTIONS
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To download the Halo: Reach Beta from the Halo 3: ODST disc:
1. Insert your Halo 3: ODST disc and access the Main Menu.
2. Select the Play Beta option and download the Halo: Reach Beta.
a. NOTE: The beta does not support background downloads. Navigating
away from the screen before the download is complete will
require a new download.
3. When the download is complete, return to the Main Menu and select
Play Beta to begin playing.
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To download the Halo: Reach Beta using a Game Code:
1.From the Xbox 360® Dashboard, press the Xbox Guide button (the
round silver button) on the controller.
2.Sign into Xbox LIVE
3.Scroll to the Marketplace screen
4.Select Redeem code and enter the 25 character code.
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DON’T MISS YOUR CHANCE TO WIN
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Report back to ExpertZone to access the Halo: Reach Retail HQ
starting June 1 and further your elite status with access to
classified intel and restricted content. You’ll also be entered to
have your tenacity rewarded with:
- Halo: Reach Noble Team Statue
- Halo: Reach Legendary Edition Games
- Halo: Reach Limited Edition Games
- Embroidered Spartan Patches