Get guestpass keys generated by API - SmartZone

Hello, I'm trying to retrieve the guest key generated by the API. I'm using this documentation: http://docs.ruckuswireless.com/vscg-carrier/vsz-h-public-api-reference-guide-3-4.html#identity-guest.... The Smart Zone Essentials version that I use is 3.5.1.0.296.

I successfully create the guest user but when I request the Identity Guest Pass endpoint, I get an empty list, though I do have a lot of guest users created as showed in image below.

[INFO] accesing URL: https://XXX/api/public/v5_0/identity/guestpass
b'{"totalCount":0,"hasMore":false,"firstIndex":0,"list":[],"extra":null}'


How can I resolve this problem?
Thanks!