Errore UEFN: "Impossibile creare il progetto" e "Impossibile creare la cartella del plugin"

This means you have a problem with UEFN and need to verify.

How to verify

Please make sure you have set your project path to local PC Folder not the Windows 11 default of OneDrive, because there is a warning message.

Try opening the UEFN Feature projects and creating and building one of them.

Then try making a blank island.