If your alarm played on your phone instead of your ROLL, check the following:
Your phone may be out of range of your ROLL – make sure the two devices are within 65 feet of each other.
The Bluetooth connection is off on your phone or your phone is in Airplane mode – make sure you keep the Bluetooth connection on.
Your ROLL has no power – be sure the battery on your ROLL is charged or the ROLL is connected to a power source.
Someone else is using your ROLL when the alarm is scheduled to go off.