If your game won’t work with the itch platform, you might want to resolve this by posting a thread in the Community. Someone might be able to help you.
Having visited your profile, I see you work mainly in HTML5 games. IIRC, itch.io just recently changed how web games work on their site, so that may contribute to your problem there. I have some knowledge of HTML5, CSS, and JS, so feel free to share bits of code either here or on Discord if you need help. (I will not develop your game for you, as that wouldn’t be fair to other participants, but I can point you in the right direction so you can code it properly.)
Regardless of whether it will run on itch’s website or not, please make sure you have a downloadable version of your game ready as per the rules of the Game Jam (it’s okay if you cheat a little by making it need a web browser to run, but if you can make it a game without the need for a browser, meaning it runs in its own window, that’d be even better).