I just connected to Interactive Brokers using the two factor authentication, it worked for me once I figured out where the authentication button was on my Interactive Brokers Mobile App.
However, once connected to Tiller, my IRA and investment account are shown with different bank numbers in Tiller however they have the same balance. In this case my investment account is correct, but the amount in my IRA in Tiller is incorrect. Let me know if anyone else is seeing this or if there is a workaround would be appreciated. Thanks for any help!