“Cannes“? As in the film festival.
Most likely you are saying it wrong, as most people do. It’s a tricky little word, and people are mispronouncing it left and right in this biz. Inside I want to correct them soooo bad! Depending on who it is, and how long I’ve known them, I most certainly do.
FIRST OFF… you DON’T pronounce the “S“. It’s as simple as saying “Can“, and you got it right!