What is the name of Android Device Manager Service
The Android Device manager is by default allowed:

&lt;wifi
    blocked="false"
    package="com.google.android.apps.adm" /&gt;
&lt;other
    blocked="false"
    package="com.google.android.apps.adm"
    roaming="false" /&gt;


https://github.com/M66B/NetGuard/blob/master/app/src/main/res/xml/predefined.xml#L19