Guild Wars 2

Just bought the magical infusion for 20 laurels and it won’t attach to my Charisma amulet. Is there something I’m doing wrong? The infusion itself says ‘double-click to apply to an unused utility infusion slot’. Well, Charisma has that, but it won’t apply. I checked the wiki and it seems that I’m doing the right thing, only, it just isn’t working.

Charisma has defensive infusion slot. you cannot put utility infusion in that. you need amulet with utility slot

there are 3 different infusion types:
offensive
defensive
utility