Lightstick question: do I need to use the Twice lightstick app for it sync during the concert?

I'm going to the Sunday Toronto Show. Does anyone know if the lightsticks will sync on the June 2nd show? And do you need to connect your lightstick to the twice lightstick app via bluetooth for it sync? Because I can't get mine to sync. The stick flashes blue when it tries to sync to bluetooth but it never connects. And it won't connect to the app because it's not synced to my phone. I bought my stick from kpoptown and I'm pretty sure it's legit.

For past concert goers, how did the light-stick syncing work when you went?