SAP Hybris Cloud For Customer Add-in for Outlook is greyed out in outlook

Hi Experts,

For an user SAP Hybris Cloud For Customer Add-in for Outlook is not getting displayed in task-bar, also all buttons are greyed out.

I have tried enabling COM-addins from outlook options.
Also tried reinstalling the add-in & restarting the system.

But still not working.

Please help.

Here is the screenshot :

Regards,
R.Ganesh