Halo Infinite Beta just disappear from my Library

Hello, I have lost my Steam account like 2 weeks ago, and when I retrieved it, the Halo Infinite Multiplayer Beta just wasnt there on my library, I couldnt play it, but it still installed.
When I try to put again de CD key, it says it was already used to play the game. If somebody can help me with this I will be grateful.
My discord is ferr#7835
(I dont know if this is the place to write about this, but I didnt found anywhere else)

This is what happens when there is no current flights active. The program will still be downloaded but you won’t be able to access it until the next flight.