VCV n/ん trouble

When I try to make a VCV UST, if "n"/"ん" is the preceding syllable, and I put, say "n を" after it, it doesn't produce any sound. I am using Kasane Teto's basic VCV voicebank (i.e. not whisper, no growl/whatever else). It is my first time using UTAU and maybe this is something obvious I'm missing, so forgive me if this is a stupid question.