I was invited on the fly.
It is nine in the morning of the 30th.
WHERE THE -Yoink- IS MY KEY!?!?!?
There was a high volume of traffic over the last few hours, meaning emails and messages were delayed.
Check your Insider profile at the bottom to see if you have a Steam code of an Xbox invite
https://www.halowaypoint.com/en-us/halo-insider/profile
You can then check the HALO INFINITE - JULY TECH PREVIEW message here on Waypoint for details on how to install or visit the Insider Support site: https://insidersupport.halowaypoint.com/hc/en-us
I get the frustration of not being able to jump in and play at that time, but please chill down a bit in future