Find My says no location found for my friend, what does that mean?

also check which device they share their location from. on their iphone it's in Find My > Me > Use this iPhone as My Location. if it's set to an iPad that's sitting at home switched off, you get no location found even though their phone is on and with them.

means their phone isn't reporting a location right now. usually it's off, dead, in airplane mode or has no signal. it also shows if they've turned off Location Services or stopped sharing with you, though then they'd normally drop off your list entirely. give it a while and it usually comes back on its own.