Sorry mate .. Because it is the Red key that you dont have ... or is knackered ...
this is a dealer job. All the codes have to be cleared out of ECU on the computer, and new codes programmed in.

You really should not be using any RED key daily .. only for emergency situations!

Scrap parts wont help much. You need a RED key .. the master. If you got a complete set, including red key, Dealer would still have to reprogramme the lot to get it working!

The dealer costs are mostly in the programming time.