Enabling the Online Framework Plugin in a Binary build of the editor (download from the Epic Games Launcher) causes packaging attempts to fail due to a file that is missing. This does not occur in source as the file is available.
This did not occur in 4.17.2
This does occur in 4.18.1 and 4.19 (Main)
Head over to the existingAnswerHub thread and let us know what's up.