The harmonizer in Cubase 12 professional

I have a question about the harmonizer in Cubase 12 professional

Let’s say you have laid down a perfect Vocal something of a Frank Sinatra Tony Bennett style
The chord track is perfect

You proceed to the audio prompt to create four harmony tracks by way of the audio prompt menu

Are there any prerequisites such as turning off the lead vocal effects to proceed here?

Is it possible that cubase 12 professional cannot handle sophisticated lead vocals with back phrasing
Including chord substitutions?

I have found out that when listening back to the four harmonized tracks I don’t even recognize my own voice and it sounds more distorted then what is produced

I welcome up all comments and I thank you in advance

Alan Russell professional arranger since 1968