Double tap activation of candies does not work

Welcome to Soda Community @swellkom

Double tapping boosters to activate is a test for certain groups of players. If players frequently use double-tapping boosters, the Studio may roll this out to all players. If it is used infrequently, this function may be turned off again for players. We have no influence on this, test groups can be changed by the Studio.

I can understand how unfair that sounds, as I also find double tapping a very nice experience, especially if you cannot combine the booster with anything else.