Collaboration centre Icon is not coming in Backoffice

Hi Experts,

In my local I couldn't find "Collaboration Centre" icon on top right. I have created a custom workflow for one of our client requirements. The workflow got created successfully which I have verified from backend. But somehow the Collaboration Center is not showing in my homepage once logged in as an admin.

Any Idea where it went wrong. Any inputs on this would be truly appreciated.

Thanks DurgaRao