IBeacon region monitoring not work consistently across devices

Question

When testing with a simple app to test beacon region monitoring I seem to get very inconsistent results depending on the device (not the device model, the specific device). The

Answer 1

Monitoring may not work for several reasons. One being that App Background Refresh is disabled to save your battery. Another one is neglecting to ensure you have setup the correct App Capabilities.

If this doesn't work there is a great post you can read that details all of the items to troubleshoot.

iBeacon StartMonitoringForRegion Doesn’t Work