For the benefit of the other 3 people with this issue I've found my own answer.
I have read that both devices need to have at least 20% charge and both need to be connected to wifi.
Somehow it is only after retreading this several times over the course of a week that I actually check that "both" devices
are in fact on wifi. The iPhone was not on wifi but still connected to 3G. Simple as that. It's all working again.