LinkedIn's web and mobile applications will send you an authentication code when you attempt to sign in the first time after enabling two-factor authentication. If you're signing in after turning on two-factor authentication, follow the steps below:
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Check your text messages on your mobile device after your first attempt to sign in to obtain the authentication code.
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Sign in again using your username and password.
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Enter the authentication code that was sent to your mobile device.
If you continue to have issues, try our troubleshooting options.