Given the history, i.e. disposal via auction, I think you probably need to have the vehicle inspected by a Mitsubishi trained technician.
(Most likely at a Mitsubishi dealer)
It could be as simple as a failed relay, or as complex as a host of removed or failed parts.
As a starting point, you could inspect and test every relay in the vehicle to ensure that they are all working correctly.
Also, the car could have been retro-fitted with a device to prevent the engine from starting, and the only way to find that is to look everywhere and test everything.
Hence my recommendation that you find a Mitsubushi trained technician, who has the right tools and equipment.
2014 PHEV Aspire, Arctic Silver;
Hayman Reese removable tow bar;
1.5kW Solar, grid connected.