Find my: sound pending even though connected

Ok, so my daughter was not answering her iPhone, so I tried to use the “play a sound” function in the Find My app to get her attention and have her answer the phone…well, when I did so, instead of playing the sound it said “sound pending: will play once connected”. Now, I know that that can happen when the iPhone is not connected to WiFi/cellular data, but the funny thing is I tried FaceTiming her immediately afterwards and she answered it just fine…meaning that she had to be connected to a network in some way, yet it still said the whole sound pending message in Find My even when we were FaceTiming…how is that possible?? Any thoughts? Thank you!