I have the same problem: Paypal shows the error: "Unsupported variable no_shipping" in edit of standard legacy addtocart button, under Advanced Variables section. I am having issues with customers missing the single line shipping input at the top of the checkout page or thinking it is the billing address and proceeding to the next screen which completes sale and they don't get a chance to change shipping address to their new address. I wish to force shipping address input by user. I was told to use no_shipping=2, but Paypal will not allow me to use this as a variable. I also can not find the page the tech is referring to, to add no_shipping=2. I asked the question in a different way and same tech responded with same guidance, but no links, and the pages he mentions do not exist in the Paypal that I have access to. If anyone figures this out, please post.
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