Adding Another User to an Active IB Key
Instructions

You can add an additional user to your IBKR Mobile - IB Key if the IB Key Authentication is already activated on your Apple device.
Open the IBKR Mobile app:
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From the login screen select IB Key Authentication
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Select Add User
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Read the instructions and tap Continue
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Enter the new user’s username and password and then tap Continue
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An SMS message will be sent to the mobile phone number associated with your account
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Enter the authentication code and tap Activate
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Enter the security element you use to secure your phone (e.g., Passcode, TouchID or Face ID)
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If successful, you will see a confirmation screen
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Tap Done to complete the process

You can add an additional user to your IBKR Mobile - IB Key if the IB Key Authentication is already activated on your Android device.
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Open the IBKR Mobile app
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Tap on IB Key Authentication (If the app opens on the home screen, TAP on I have an Account followed by IB Key Authentication).
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Tap Add User:
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Read the instructions and select Account Credentials:
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Enter the new users’s username and password and then tap Continue:
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Tap on Get Activation Code:
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Enter the authentication code sent to the mobile number associated with the user and tap Send:
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Enter the existing IB Key PIN you use to secure the IBKR Mobile app:
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If successful, you will see a confirmation screen.
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Tap Continue to complete the process.
Additional Resources
Learn About Two Factor Authentication for iPhone at IBKR Campus
Learn About Two Factor Authentication for Android at IBKR Campus