According to the Interactive Brokers security policies, only one IBKR Mobile Authentication (IB Key) instance can be active for a given user. It is not possible to have two IBKR Mobile Authentication (IB Key) instances active at the same time on different devices. Also, the IBKR Mobile Authentication (IB Key) can not be installed on an iPad.
In case 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) on the same smartphone or migrate it from one smartphone to another (e.g. from an old to a new smartphone) as explained in the IBKR Knowledge Base.
In any other case, we kindly ask you to contact IBKR by telephone.