When clicking the Print to PDF button, Nintex seems to start generating the pdf, but when it tries to return the file to IE, I get a 404 page not found error.
In the address bar there is a seemingly valid address for the pdf file (https://neu-des-fol.nintexo365.net/services/NfPrintServices.svc/DownloadFile?key=PDF_8e7295c706524c7d8f7af160b97d50d2 )
In Google Chrome the pdf file downloads without problems.
Does Nintex require any special settings in Internet Explorer?