Account not authorised to play Halo Infinite

So I’ve downloaded the Infinite flight using the provided Steam Key. But when I try to sign into the corresponding XBL account within the flight, I get a pop up message saying my account isn’t authorised to play. Is it because we’re outside of the dedicated time windows? Would be kinda weird, since the info sheet you get with your invite says you should download the game and ‘make sure you can connect’ before the time of actual testing begins. I’m kinda worried I won’t be able to participate later today, was really looking forward to this. Any help or information on the matter would be greatly appreciated!

Doesnt start til 12 cst

Don’t give out false information please. Not helping anyone. That statement is absolutely wrong my guy.