If you minted your NFT but not it doesn’t show up on Rarible. Try visiting Opensea and search your NFT by title, it probably already shows up in Opensea.
If you found your NFT in Opensea, check the “chain info” tab and find the Contract address and Token ID. Then copy the contract address and token ID, put it into the URL format below. Then you should be able to see your NFT now. Then press “put on sale”, sign it and the NFT is showed up on Rarible now.
Good luck, this method works on my case at least. Try it!
PS: remove the space between “co” and “m” on the URL address.