While in Force Awareness mode, Obi-Wan will let you know when there is a disturbance in the force. With your Force Band on, reach out and feel for vibration feedback. Slowly turn in place with your arm outstretched. As the vibrations get stronger, hold your wrist steady until you hear a rising sound. Once you hear it, Force Pull the Holocron towards you. Your Force Band will let you know what you’ve found.
Once captured, select the "Holocron Vault" in the app and you will be able to solve the puzzle to reveal your Holocron.