Exactly the same problem here.
There is no "Application Data section" (step 4) on macOS 10.14 (18A365a). Instead there is a folder called "Full Disk Access". Could it be that Apple replcade Application Data with "Full Disk Access" on the latest Beta version of Mojave?
Cookie 6 not recognizing "Full disk Access"
Enabling Cookie5 on macOS Mojave (10.14)