unanswered question concerning private key

unanswered question concerning private key

Scenario: I have a wallet at blockchain I lost the paper with the second password and private key I have the wallet address, the login password to the wallet, and 12 word mnemonics I was suggested to make a brandnew wallet, then import the old's wallet's address I've done so, but it imported as a "watch only" address and it wants the private key. I used the bip39 with my mnemonics, but the address is not to be found in the bip39 generator. What can I do?

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