Not sure what to make of this one.  I have two nexus 6P's.  

 1. Phone A won't charge on included charger+cable+outlet, however it does charge on a variety of other chargers I have access to.  

 
 2. Phone B charges on the same charger+cable+outlet Phone A won't charge on

Any ideas as to what's wrong and how to resolve?

**Edit:** From comments *Both phones charging on the same setup (charger/cable/outlet).*