Can I register IBKR Mobile Authentication on a second device?

No, it is not permitted to register IBKR Mobile Authentication (IB Key) on a second device.

You may have the IBKR Mobile app installed simultaneously on multiple devices but the integrated authentication module (IBKR Mobile Authentication (IB Key)) can only be active on a single smartphone, on which you will complete the Two-Factor authentication tasks triggered from any other device.

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