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Secure your account with 2FA
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Permission denied (publickey)
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ssh-add: illegal option -- K
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Securing your account with two-factor authentication (2FA)
You can set up your account on GitHub.com to require an authentication code in addition to your password when you sign in.
About two-factor authentication
Configuring two-factor authentication
Configuring two-factor authentication recovery methods
Accessing GitHub using two-factor authentication
Recovering your account if you lose your 2FA credentials
Changing two-factor authentication delivery methods for your mobile device
Countries where SMS authentication is supported
Disabling two-factor authentication for your personal account