This suggests that you've left your iOS device listed as 'Missing' in your Devices Dashboard.

Please refer to the article describing how Hidden for iOS tracks location: http://hiddenapp.com/support/faqs/how-does-hidden-ios-track-missing-device/

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.

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