"The input provided was invalid" error message on product

Hi all, I'm setting up my Square Online shop and keep running into this issue: when clicking the CTA button on an item detail page, I get the error message "The input provided was invalid."

This is happening across different item types (events, physical goods, and "other"). I have double checked all the settings I can think of and nothing seems like the obvious answer for what is going wrong here.

 

Any thoughts?

 

Screenshot 2026-09-15 at 5.01.34 PM.png

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