Yeah dude. Mine didn’t work straight away either…..
I worked out that i didn’t follow instructions right……
Best guess…..
Hop in car & stick new key in ign.
Do the ‘turn to lights on dash, manually lock doors, wait 30 secs, manually unlock doors, remove key from ign, step out if car & shut door & press lock button.
If it doesn’t work for u, maybe someone else can provide some better help.