Thank you all so very much for your replies!
I did try to check out Shadowlands website from a different browser and after clicking the OPT-IN it redirected me to battle.net login screen!
So, it seems that I was logged in to my battle.net account already when I opted-in!
Original post:
I have just found out this OPT-IN for JOIN THE BETA feature on Shadowlands official site.
I am not sure I follow how this one works.
I’ve opted-in now and it tells me: “Your opt-in has already been recorded. We’ll let you know!”
Since there is no way to log in to this site with my battle.net account, how Blizzard know it is me opting-in? Is it an IP bound feature?
fingers crossed for beta invite