No Output Voltage On Power Mux
You didn't connect pin 5.
I would suggest trying to make a connection south or east of pin 5 to the ground plane by carefully scratching the FR4 above that ground plane.
However, C46 neither seems to be connected to GND. If there are more unconnected components, you'd better redesign the PCB. See yellow arrows in picture below.  

Make sure you use a DRC. DRC would have detected these unconnected components.