It is the Engine immobiliser that is not recognising the key.
The key has a chip in it that communicates with the car's immobiliser and allows you to get the engine running and keeps it running.
If this is not happening, the car starts, but cuts out after 1 or 2 seconds.
Have you tried the other key to see if you get the same symptoms?
If you have the same problem with both keys, it could be the immobiliser itself. Otherwise you just need the key re-programmed at the dealer.
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