Something like this should work… you would of course modify it to use your home assistant instance, the sensor you want to monitor, alarm panel name, and device you want to notify…
Flow:
[{"id":"4d44ae57.0d5bd8","type":"trigger-state","z":"1ce2dbec.424954","name":"BinarySensor","server":"b2dc7545.2e5d78","exposeToHomeAssistant":false,"haConfig":[{"property":"name","value":""},{"property":"icon","value":""}],"entityid":"binary_sensor.bathroom_motion_sensor_occupancy","entityidfiltertype":"exact","debugenabled":false,"constraints":[{"targetType":"this_entity","targetValue":"","propertyType":"current_state","comparatorType":"is","comparatorValueDatatype":"str","comparatorValue":"on","propertyValue":"new_state.state"},{"targetType":"entity_id","targetValue":"alarm_control_panel.alarm","propertyType":"current_state","comparatorType":"is_not","comparatorValueDatatype":"str","comparatorValue":"disarmed","propertyValue":"new_state.state"}],"outputs":2,"customoutputs":[],"outputinitially":false,"state_type":"str","x":130,"y":140,"wires":[["1eeb1c2a.0949a4"],[]]},{"id":"1eeb1c2a.0949a4","type":"api-call-service","z":"1ce2dbec.424954","name":"Notify Phone","server":"b2dc7545.2e5d78","version":1,"debugenabled":false,"service_domain":"notify","service":"mobile_app_ifone","entityId":"","data":"{\"title\":\"~~ALERT~~\",\"message\":\"The bathroom has an intruder!!\",\"data\":{\"sound\":\"default\"}}","dataType":"json","mergecontext":"","output_location":"","output_location_type":"none","mustacheAltTags":false,"x":350,"y":140,"wires":[[]]},{"id":"b2dc7545.2e5d78","type":"server","name":"Home Assistant","legacy":false,"addon":true,"rejectUnauthorizedCerts":true,"ha_boolean":"y|yes|true|on|home|open","connectionDelay":true,"cacheJson":true}]
Node w/ Simple Logic: