Yesterday after installing my bulid and realizing that the flight does start until today, I waited until about now to load up the game. But yet I’m still receiving the same messaging of “This account is not authorized to play Halo Infinite”. So I know it’s not me. I gotten multiple email confirmations that I’ve been invited, and followed all the steps to play but still the same problem. And I’m not the only one receiving this message too, does 343 know that this is even happening?
Some players are having success by hard setting consoles and cahe clearing and reboots, perhaps these are options you’ve not tried ?