When I make SetExpressCheckout API call against PayPal live server I receive following error: "You are not signed up to accept payment for digitally delivered goods."
The error indicates quite clearly that I should enable digital goods option from my business PayPal account. I found out that it should be possible to enable "Digital Goods with Express Checkout" on the My Business Setup page. However when I choose the option "Change" -> "Add new" I'm taken to page where the available options are displayed and when I choose "Digital Goods" I'm just taken back to My Business Setup page without any notifications and no visible changes. It seems that adding Digital Goods as an option is not working. What I noticed there was the text "Requires Sign-up" only in this Digital Goods item, which could be the missing part but I don't know what it actually means or where I should Sign-Up.
Anyone has any ideas how to solve this "You are not signed up to accept payment for digitally delivered goods." problem when using Express Checkout API?