Issue with eBay

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I cannot integrate my eBay account with my Shopify store. There is an error showing "Failed to publish offers for group: The eBay listing associated with the inventory item, or the unpublished offer has invalid data in the associated Return policy. Rückgabeoption fehlt oder ungültig. Aktualisieren Sie Ihre Rückgabeoptionen."

Please help me to resolve this issue so that I can continue my journey in a smooth and easy way! Only 1 product out of 120 got approved for publishing rest of them having this error text.