Signature not activated

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

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

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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?

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

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