Used vs Refurbished restrictions

I’m new to selling on Amazon, was previously an eBay Only seller. I am having issues in understanding the restrictions Amazon out in certain items. To my understanding, Amazon have a major distinction between used & refurbished items. Refurbished items are very limited and require approval but used items, no matter in excellent, good or fair condition are often okay to resell? Is this correct?

When I go to list inventory for printers I have its restricted. Is that because the Item themselves are restricted, is it because they’re used and must be approved or because Amazon thinks they’re refurbished? If so is there a way I can change the condition of the item?