2013 Lexus GS250 Keyless Entry on One Door

[Edward Mitchell IS250]

Gentlemen, GoodDay to you. Just sold my beautiful '07 IS250 and purchased a 2013 GS250 F-Sport with 36,000 on the clock. Everything works apart from one small problem - the passenger front door. All four doors lock/unlock using the key remote, and the other three will lock/unlock from the outside on a keyless basis. This action also unlocks the front left door.

However, the front left door will not lock or unlock just using the exterior door handle, on a keyless basis.

Any ideas, please?