After buying some nft's from a creator on opensea (using Polygon on ETH), they sent me one for free. They asked me for my polygon address, and assuming this meant the poly/eth address that is ubiquitous on my metamask, I sent it, and he sent the nft.
Today I checked and did not see it in my collection inventory; went to the creator's page and clicked on the nft in question, and it does show as sent to me / and owned by me. Thus far I've contacted the sender/creator to let them know, and have yet to get any feedback. I've also cleared out my browser cache and reset/disconnected/reconnected my metamask wallet, and still trying to solve this.
My question is what could have possibly happened or gone wrong, and how to rectify this situation? Thanks in advance