Kiosk license retired as of October 2019
From July 16, 2019 Google has been communicating to their customers and partners that Google will be retiring the Chrome Kiosk (Single App) license on October 1,2019
What's the replacement?
This is replaced with the Chrome Enterprise Upgrade License
What's the difference?
The Chrome Enterprise Upgrade License offers all the same functionality as Chrome Kiosk (Single App) license plus additional features only available through the full license, including user policies, public sessions and PC workstations (use the device as a workstation, access to web and virtualized desktop and applications).