Printer details are the address of the printing press. Publisher’s do not provide the printing address details directly. I have searched the FAQ’s of KDP Amazon, Notionpress as well as Pothi.
As a self-publisher, you can ask the publisher their printing details. I found it in my author’s copy of KDP Amazon.
The other choice I had was to Google the address of the publisher and try to use their publishing house address as printer detail. However, I got the ISBN number prior to it.