Well I would disconnect the battery for 30mins and reconnect to see if it makes a difference the car has not been in your possession that long so the electrical history of the car might not be know. The Renault clip is what you need so the function tests can be carried out and the vehicles vin numbers should be the same on the major components. It should be the optical sensors that has the problem but your saying pulling the drivers door handle with the key present there is not working as you said the passenger door unlocks with the handle and then below on one line you says it doesn't unlock with the handle if you have a second key card try that.
For a Laguna there was this "For reference, Keycard in, engine running press and hold lock button (red) until bleep confirmation toggles keyless entry on and off."
For a Laguna there was this "For reference, Keycard in, engine running press and hold lock button (red) until bleep confirmation toggles keyless entry on and off."