Every time I've added a blue remote key in ids it has worked fully and with remote function.
I can only guess that your fob battery is flat from being stored (although mine can be left for a very long time and still work without going into the ignition to charge them)
Did yours still not work after using the key in the ignition and going for a run?
If your original 1 works and you've done the above with the new 1 then imo it's not looking good

I see no reason for it not to work other than it being fooked.
Options are, send it back to china or split it and meter the battery to see if it has power etc and try to fix it.
How much did you pay for the fob? Can you be certain that it isn't 1 of these replacement shells? (Probably a silly question but hey)

56 350 2.2 130ps mk7 with 2 side doors
65 290 2.2 125ps custom with 2 side doors
07 350 170ps
Ids v86 licence + v86.04 update + xprog
hereIds map
here