I've done this on 3 different machines, so I can confirm it works if you follow the exact directions I posted (assuming you are using a recent version of 1Password and Enpass). Did you check your export from 1Password to make sure it actually contains anything? If you're sure there is data that was successfully exported, make sure you're pulling out everything inside the .1pf file, this will typically include a data file and 2 folders (though this will vary depending on what you actually exported).
The folder you point Enpass at needs to have a data.1pif file and perhaps also folders for certain types of other things you exported. See the attached screenshot as an example. This is all inside a folder I happened to call "Export" and I pointed Enpass at the "Export" folder and told it to import 1pf from 1Password.