I just created my account for the itchio website, and I am trying to make a bundle on sale when I go to click the "Create bundle" button but every time I try to do this I get directed to the main dashboard with a prompt that says "You can not make a sale without payment method," the problem is that I've already linked my PayPal account and debit card. How can I fix this?

A few things come to mind: You must have a valid project for purchase on your page to create a sale with it. You have to complete the seller onboarding. Adding a “debit card” makes no sense here, since a debit card is something used for purchasing items, but this error is about configuring your account for selling items.

Hope that helps

"You have to complete the seller onboarding."

I had to provide a debit/credit card to complete that process. I assumed the reason was so that itch.io would have a way to provide the proceeds of a purchase to the seller.