According to the Interactive Brokers security policies, only one IBKR Mobile Authentication (IB Key) application can be active for a given user. It is not possible to have two IBKR Mobile Authentication (IB Key) applications active at the same time on different devices. Also, the IBKR Mobile Authentication (IB Key) application cannot be installed on an iPad.
If you have access to your mobile phone number or to a physical security device currently active for your user, you can reactivate the IBKR Mobile Authentication (IB Key) application on the same smartphone or migrate it from one smartphone to another (e.g. from an old to a new smartphone).
Should you need additional assitance, please contact IBKR by telephone.