[HELP] validate wallet through the Decentralized Applications (DApps)

I made a NFT long time and posted in few of NFT discord servers Now, someone is interested in buying that but getting error

<someone> says:

RESPONSE FROM SUPPORT:

It's because the seller's wallet has encountered a lapse due to service error and some decentralized glitches, It requires the owner to validate their wallet through the Decentralized Applications (DApps) and then buyers can proceed with the transaction successfully

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What I do, Using OpenSea and MetaMask Wallet