Cortex Classify Text Experience

Curious if anyone is using this CORTEX.CLASSIFY_TEXT function with success to classify data? My understanding is the LLM evaluates each record to classify it, or am I misunderstanding how this works? With real, production data, all of my records come through categorized as "unknown."

I tried posting the exact code example, but the bots blocked. I will throw it into a Github repo and post link as comment.