SOS diagnostics should be able to make a new key which will work in the door lock and ignition using your VIN number but you would have to remove and send them your SKREM unit and I believe there is a $50 additional charge versus if you had a working key to send them. Another option would be the year SKREM delete which would allow you to use the key and ignition cylinder that you purchased but I do not know who offers this service or what it costs. The Mercedes swap shop may be able to help you… I bought a spare flip key from them but I had a working one to send them. I’ve seen mention of an SKREM emulator but I’m not sure what that entails or what it would cost. If you were able to get the SKREM unit from the car that your steering column and ignition cylinder came from you could probably swap that out so your car would recognize the chip in your key.