Getting error : Oh dear, you cannot sell this item on Etsy.
Etsy requires you to be the manufacturer of your own products. Provide the information about the Product Partners by editing the Profile. Once done, save the profile and try publishing the products on Etsy.
Here are some cases of “About the listing” in which you need to provide the “Production Partner” within the product or you can assign them from the Profiling section:
a.)With "Another company and person" -- "A finished product" -- "Made to order". Then “Production Partner” is mandatory on etsy.com and needs to be assigned from the App as well. 
b.) With "Another company or person" -- "A finished product" -- Recent years like "2020-2023. Then “Production Partner” is mandatory on etsy.com and needs to be assigned from the App as well. 
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