I am unable to use my third fast past for some reason and can only use 2 of them. I try unlocking a chapter but it says no Fp Deceted even though my thing says it has a fast past.
Fast pass
I didn't get my fast pass for check in
In your profile click on your fast pass tab, see if the unusable fp is a single work or genre specific fast pass.
Sometimes the system lags, if it hasn't arrived by now try hitting up webnovel support