it is standart problem with keys 2004-2006 year with key number 8E0837220K . You should to make new key with remote 8E0837220Q (2007-2008 years). About this problem you can read here https://ikey.by/izgotovlenie-chip-klyuchey/audi-izgotovlenie-chip-klyuchey/izgotovlenie-chip-klyucha-audi-a4/, you should programm only new original key with number 8E0837220Q.