Hi, I made this activity call myself as me and Abhi are helping Tyler host this, and we and don't appreciate you attacking Tyler over your failure to schedule properly. The short and simple explanation for your activity loss is that your opponent gave their specific availability (4 PM - 10 PM) and even suggested a specific time (7 PM Saturday), while you did neither and showed up at random times and made it impossible for your opponent to know when you were available to play.
I talked to the TD that you talked to and you didn't give him the full story, and after I showed them the scheduling from your wall, they changed their answer. You need to give specific hours of availability if you want the other person to be able to schedule with you. You could have suggested a time that was in your opponent's time range that worked for both of you, but you never did, while your opponent tried doing that, even while you never stated your hours of availability.
You only said you were free all day Friday and never said what hours you were available on Saturday nor Sunday. Your opponent tried suggesting a specific time as well, which counts as them trying to get the game done.
I did talk to a 3rd TD and they agreed that your opponent gets the win based on what I already said above. At worst it could've been an extension, but your opponent still doesn't know when you're free and you only get an extension if the host can see that both players look like they have a specific day/time in the extension window before granting it. The decision is final and I would recommend checking out this helpful link for future scheduling:
https://www.smogon.com/forums/threads/tournament-scheduling-guidelines.3642746/.
Have a nice day