To Autoroute SMD components, the layer that those SMD components are on **must** be selected in: Router Layers > **Configure Layers** If that layer is not selected then the Autorouter cannot route a short segment of track from a single layer pad on the SMD component to a via to then transfer the routing onto any other layer. Here is the schematic for a simple project with 5 through-hole in a circuit and 5 SMD resistors in the same way in a copy of the circuit.  And here is the PCB: The SMD resistors are on the top layer. The (Local) Autorouter is set to route on the bottom layer only:   Only the 10 connections to the through hole pins are attempted and completed. No attempts have been made to route top layer 0603 SMD resistors on bottom layer.  Through hole resistors on top layer route on bottom layer only with no problems but no vias are placed to route top layer 0603 SMD resistors on bottom layer.