V50 suddenly doesn’t start anymore

Hello together, Since a good year, I am proud V50 2,4l owner. Actually also totally happy with the car. Yesterday I turned my car off at home and wanted to start again after 2 hours approx. Zack car no longer starts. Starter battery is full and has no big voltage drop. Key battery is also quite fresh. I ignition in position 2 is normal the ignition, without warning messages or other unusual events, ignition in position 3 it remains with it. I ignition quite normal, radio and inside light remain however also on ( in position 3 switches off normal everything ). Starter I checked, which is i.o. Nothing is stored in the error memory. Is there any problems with the ignition lock or with the immobilizer with the V50? I’m slowly a bit helpless… if you still have other ideas then gladly out with it.