I tried plugging the generator into the external outlet but the inverter had an unusual display.
On re-reading the Xantrex manual, I discovered the generator has to be connected to the 'AC In' terminal.
Two problems exist.
1.) There has to be a circuit wired for the inverter, from the back porch outlet, to the inverter.
2.) One of the 'AC In' terminal blocks is bad.
I discovered the connector is a WAGO device.
That block (VAC Line) has to be replaced or the wire soldered in place after removing the bad terminal block.
