Could you help me to fix the error > 'Someone has already added that SSH key'.
The error means that someone else is already using this SSH key. You must use a different key.
Do you know how to understand what account and platform use the same key?
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It doesn't matter, you should not be sharing keys between accounts.
You should create a new key for your new account and use that instead of using a key that belongs to another account.
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