My Client Groups Missing

Summary

My Client Groups Missing

Content

Hi,

I have configured the Default Home Page Layout to 'News feed' and have enabled all relevant Profile options; however, when I login I don't see 'My Client Groups' although, I can see Me, My Team, My Workforce, Payroll, My Enterprise, Tools, Configuration & Others.  I read MOS Note ID: 2473528.1 which suggests I need to set the Show on Navigator option for My Client Groups; however, the option does exist on our Structure page.  The steps I have followed are:

1) Created and Activate a New Sandbox
2) Navigate: Navigator > Configuration > Structure
3) On the Navigation Configuration Page I have scrolled down the list and cannot see the option 'My Client Groups'