This may be my problem:

Navigate to Dashboard > Comments > Forms admin page, edit the Default Form,

No default form. I'm using twenty twenty-one so it should be there. Also, it is showing up fine without WPDiscuz

Do you have any ideas?

Sorry for THIS response. It was the first thing I did. I tried it numerous times. I am pretty sure I told you that. Anyhow, I found someone to fix it from the back end. Thanks