This suggests that you've left your iOS device listed as 'Missing' in your Devices Dashboard.
You can head over to our article describing how Hidden for iOS tracks location HERE.
Setting your device as 'Secured' in your Devices Dashboard will stop the alarm notifications. If the alarm notifications persist after setting the device status to 'Secured', try restarting the device.
Why do I keep getting alarms from HiddenApp on my iOS device?
