I have a few products with color variants. The quick add button allows choice of color and add to cart. On the main product page, the add to cart button doesn’t work after switching color variants. I’m using the Dawn theme.
You can see how it works here: https://shopvarenne.com/products/snap-front-corduroy-mini-skirt-olive-tan?variant=40580306829405
Previous answers to this same question did not actually list out the solution for me to try. They are just marked resolved.