<ul><li>Receiving a two-factor authentication code for a service you don't have an account with can happen if your phone number was previously owned by someone else.</li><li>This is known as phone number recycling, where the previous owner registered an account using your current phone number.</li><li>If you plan on creating an account with that service, contact their support team to detach the unknown account from your number.</li><li>Under no circumstances should you use the one-time codes to access an account that doesn't belong to you, as it is illegal and unethical.</li></ul>

Authentication codes from a service you don't have an account with | Kaspersky official blog

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