using vag-com and you skc
Provided that the transponder/immobilizer-capsule/immobilizer-chip of the key you bought are compatible with the ECU and Comfort System of the Car you have I think...
2 Fobs I bought for instance (HLO 1J0 959 753 AH & HLO 1K0 959 753 G), are programmed to unlock the doors and trunk (oh yes, the trunk as well), but, they just refuse to be programmed key-wise... I've tried with both VAG-COM and a SEAT Authorized Reseller but nothing, nada, zip, niente, τίποτα (that's Greek)... So I'm stuck with 2 Fobs that both can unlock the doors and trunk, but, the key is just not working...