Signature not activated

[Abadi]

I am trying to list NFT on Opensea using MetaMask. It is requesting that I sign the transaction but the “sign” button is inactive and therefore can’t list the item. Can you please help

[Tksly]

Please check which chain the NFT you need to list belongs to. The NFT of a different chain cannot be listed

[Abadi]

Thank you for your reply. I should check the nft chain against what ? Im not sure if there is an option to choose on Opensea?

[Tksly]

Select your NFT in the opensea account, click sell, and then you can see which chain you are corresponding to，The purple eth below me is a polygon chain