I figured out what happened. There was an error a SQL error in the logs showing langcode cannot be null. I looked at the header of my csv file and the column titles langcode and body were concatenated into the langcode column header. I fixed that and the import worked!
Note
the "Click Here and Download Sample CSV" butting creates a file with this issue. There is no body column, and the word body is appended to the langcode field [langcodebody]- 🇺🇸United States nfriend
Yes I confirm #2 - the sample file incorrectly labels the column, in my case "langcodepromote" not "langcode". When I changed it to "langcode" and populated all the rows with a code - in my case "en" - the import worked.
Thanks for the module!