Seller is instructing me to ignore return label and wait for them to issue a different one.

TL;DR I bought a 50 lb piece of furniture on Amazon that was shipped by a marketplace dropshipper from a private brand’s warehouse. It came damaged and I opened a return.

The return instructions said “We’ll issue you a full refund but you’ll need to pay for return shipping.” I sent a message to the seller and called Amazon to clarify I wouldn’t be on the hook for shipping the damaged item back. Amazon rep told me no extra charge and to go ahead and ship using the UPS label that was issued via the returns process.

Seller then messaged me saying don’t use that label and wait for one to come from the furniture brand so it goes back to their warehouse. They said it needs to be FedEx and to not use the UPS label.

Am I going to be screwed out of Amazon’s seller protections if I follow the seller’s instructions to use a different label? I’m confused because they said for a refund to be issued, the item needs to go back to the furniture brand for inspection. But I Googled the address on the originally issued return label and it IS the furniture warehouse, not the seller’s address. I told them this and they’re still saying they need to issue a FedEx label.