The ring for 5 minutes function on Android Device Manager is a great tool that I have used multiple times to find my phone (which I happen to misplace quite often).

The thing is, it doesn't work.  Or rather, my phone will not ring even when given the cue from Android Device Manager to ring.  I have it set up on my phone, and am able to locate my phone just fine. However, when I click ring, my phone beeps once, and there is a notification that says "Android Device Manager" with the subheading "Ringing...", but my phone never actually rings.

Does anyone know why this happens, or better yet, how to fix this? Any help would be great.

I have a Samsung Galaxy S6, and yes, Android Device Manager *is* set as an administrator on my phone.