...

Windows

If 10 users if not receiving a Desktop Notification you need to:

1. Click on Start at the taskbar.
   Image Modified
2. Open Windows Settings by clicking on the gear icon at the left.
   Image Modified
   
   
3. Click on System.
   Image Modified
   
   
4. Select the Focus assist.
   Image Modified
   
   
5. Make sure that Get all notifications from your apps and contacts is selected.
   Image Modified
   
   
6. Make sure that Your Browser Notification option is enabled.
   Image Added

Mac

1. Make sure that Your Browser Notification option is enabled.
    Image Added