How to change default DPSK expiration in vSZ-E 3.6.2.0.78?

unknown

I am unable to change default DPSK expiration. There's no option in the GUI or CSV DPSK import file. There appears to be a CLI command that can change it per the 3.6.2 CLI Reference guide, but the command is not available in the CLI for my vSZ.

Has anyone else successfully changed the default DPSK expiration?

Thanks.

Update: Figured it out. The CLI option only shows up if DPSK is already active on the SSID. It won't show up if there is no DPSK available to configure. 

The CLI doesn't show the precise configuration context, so it wasn't clear I was in the wrong area.