Help to activate

Hello friends I’m an old Halo player, I’ve played everything except Halo Wars 2 and Halo 5, so I submitted my request. Hours later I bought Halo: Master Chief Collection for Pc on Steam. And I just realized that Halo 3 doesn’t show up. I was seeing that I need a code to access, so how do I get that code? Or does it come in the mail, or something like that?
Thanks

Hello!
Yes, you get a personal Steam code here on Waypoint to partecipate in the flight, but first you need to join the Insider Program (link).
Unfortunately, the Halo 3 flight ended 3 days ago.
Hope this helps!

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> Hello friends I’m an old Halo player, I’ve played everything except Halo Wars 2 and Halo 5, so I submitted my request. Hours later I bought Halo: Master Chief Collection for Pc on Steam. And I just realized that Halo 3 doesn’t show up. I was seeing that I need a code to access, so how do I get that code? Or does it come in the mail, or something like that?
> Thanks

Are you talking about your main game on Steam or a early access beta key? Each game can be bought on Steam for $10/title. You can also buy all of them for $40 in a package deal. Verify that you have bought all of the games, and not just one. Halo 3 has not been released yet, so that one cannot be downloaded until release next Tuesday July 14th.