Yesterday my friend told me that the beta was here and i signed up 7 or so hours before the beta launched would i still be able to get the code?
Probably not. There was a selection process and acceptance emails went out two days ago. The emails with instructions for getting into the tech test have been going out since yesterday.
Just like the post above ^^^ mentions, it’s too late to be a part of this flight (not beta) as players were selected a few days ago.
Being signed up for Halo Insider gives you a chance to participate in future flights. Be sure to have email notifications on so you’re aware when you get invited to play.