Invited for PC for infinite, but no code for steam

I received the invite on email that stated (below)

Looking on my email and on waypoint I dont see a link for steam or notification or message on top right

"
WELCOME TO HALO INFINITE!

MISSION
We’re excited to invite you to multiplayer tech previews for Halo Infinite this weekend and next! During this weekend, September 23-26, our goals will be to receive feedback on Arena, Training Mode, as well as the new Halo Waypoint web and app experiences. Next weekend, September 30 - October 3, Big Team Battle will go live and take it up a notch.

On Sunday, October 3, we will be sending out a survey to a portion of Halo Insiders to collect feedback on the flight. Please keep an eye out for it, as it’s valuable to get your thoughts and feedback while everything is still fresh in your mind.

Please head to Halo Waypoint, click on your most recent flight, and read up on how to download your pre-release build."