Need help integrating Zooz S2 controller

I am trying to install the Zooz S2 stick for the first time, but am getting a Z-Wave validation failure error.

“mount” does not show a /dev/ttyACM0 device.
“lsusb -v” lists “Bus 001 Device 007: ID 0658:0200 Sigma Designs, Inc. Aeotec Z-Stick Gen5 (ZW090) - UZB” but reports being unable to open it.
“ls -l /dev/serial/by-id” shows “usb-0658_0200-if00 -> …/…/ttyACM0” indicating, I think, that the controller is mounted.

How should I troubleshoot or correct the problem? Any suggestions will be gratefully appreciated.