The Yale Smart keypad can only be paired to one lock. The Keypad will need to be disconnected from the Entrance lock and paired to the screen door lock. Once paired to the screen door lock, with the two locks connected to a bridge/s, then the DualDoor™ feature can be activated. When the screen door lock is unlocked/locked so will the entrance lock. If you do not have DualDoor™ setup, then it can only work with 1 lock.
If you had users and PIN codes setup under the keypad on the entrance lock, these will need to be re-added. This information cannot be transferred over due to privacy requirements.