On my XC90 you have to hold the button (on the key fob or the car interior button) for a couple of seconds before it opens. This is good as saves accidentally opening the tailgate onto a person/wall/post etc i guess.
As has been said mine also opens as long as I kick once under the 1st O of Volvo on the boot-lid and then stand back slightly (have you tried the standing back slightly after the kick?)
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