Ethereum

I have received from a platform to my Coinbase Wallet X amount of "Tether USD", I received to my email a contract from Etherscan saying that I need to pay the 12% of that X amount to be able to withdrawn the total capital. This 12% must be send in Ethereum to the sender wallet. They say "case despriction: legalization, withdraw". I add that I am from Europe.

In my Coinbase Wallet it shows this X amount bellow "cripto", but I still have 0.00 dollars to use.

I don´t understand why are they asking me to pay that 12%!? Does anyone know if it is a scam or how to solve this without having to pay 12%?