Thanks John-
I had viewed that thread & indeed, that was part of the problem. However it didn't answer why metainfo was not appearing on the JSitemap dashboard after importing a csv file, which turned out to be a formatting error on my end when saving the csv file.
For anyone else viewing this thread- what I did was export the csv file from the dashboard and populated with metainfo for both
www.domain.com & domain.com. Then when saving the file, you have to be sure to save it with semicolons as the field separator, not anything else (I had overlooked it & accidentally saved it with commas separating the fields). If you overlook this the file will be unreadable by Jsitemap.
After I did this, metainfo appeared on the dashboard for
www.domain.com, and although I couldn't see the metainfo on the dashboard for domain.com, metainfo is seen on the frontend for both
www.domain.com & domain.com.
Thanks again for the help.
Rene