Why does my lead have a "Mapping required" badge on it?
As PropertyEngine records leads from all sorts of sources we don't always have control as to the naming of source when it arrives at PropertyEngine. For instance if your account is integrated with PropData then your leads may be set to sources set on PropDatas application which may not match what you've configured on PropertyEngine.
When a lead has Mapping Required set then it means that we've received a Marketing Source that hasn't been setup for your account. To resolve this follow the instructions on how to map a new source here (you only need to do this once per new source)