For automatic transmission vehicles, please be aware the vehicle always need to be in P(arked) modus to be able to start the engine.
For manual transmission vehicles, please be aware you always need to push the clutch to be able to start the engine.
If you have tried everything and it is truly not working, please call Roadside Assistance.
They are available 24/7 and you can reach them by calling +31 20 740 0952.
In case the Roadside Assistance needs to come on site, please be aware additional charges may apply, check What does Roadside Assistance cover?