app restriction can’t be retrieved with the RestrictionsManager.getApplicationRestrictions in Android - android

I'm following the google documentation for how to get the application restriction:
https://developer.android.com/reference/android/content/RestrictionsManager.html
https://developer.android.com/work/managed-configurations.html#define_restrictions
I've created a simple app in the link: https://drive.google.com/file/d/0B3W27jXj1LJyNmNtWUtJQ3BhcXc/view?usp=sharing
I debugged with samsung galaxy note4 with android OS version of 5.1.1 which is enrolled with Android for Work in google’s page. The current problems are:
app restriction can’t be retrieved with the RestrictionsManager.getApplicationRestrictions
“ACTION_APPLICATION_RESTRICTIONS_CHANGED” can’t be received.
Is there any problem in my code? Does anyone successfully get the application restrictions?

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I recently released my app to the Google Play community. The team and myself tested the app on Gingerbread, jellybean, and kitkat. All were either Samsungs or Nexus. Now we have someone getting a crash on a Motorolla Droid Bionic, Android version 4.1.2.
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Recently, I uploaded an android application to Google play and checked it in various devices and it is running fine.
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For more details on this you can visit this link.

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