Bought 2008 RL yesterday. Driver door does not open with fob in pocket

Bought a used 2008 RL technology package yesterday. Only one key fob Driver 1 came with the car.
Fob locks and unlocks door but does not open door with handle pulled.
With door open with fob remote, I get message Welcome but not welcome driver 1

I need to buy one more fob and one spare chip key

I do not want to go to the dealer

Please advise