How to enable desktop notification (ie browser notification) with Zoho Desk/

How to enable desktop notification (ie browser notification) with Zoho Desk/

I use Chrome on Linux. I have removed all blocked website from Chrome's desktop notifications. Plus, zohodesk is whitelisted (enabled). Browser notifications are working. I can visit this site and test them, and they work
https://web-push-book.gauntface.com/demos/notification-examples/

But I have never seen a notification from zoho desk.
I saw this forum post https://help.zoho.com/portal/zohocorp/community/topic/desktop-notification-15-10-2015 which says desktop notifications are available.

What I am doing wrong so that they don't work for me?