Unable to see Dynamic 365 button in the Outlook App while using Dynamics 365 app for outlook

Hi Experts,

I am one Dynamics 365 Customer Engagement. 

I have installed Dynamics 365 App for Outlook following the steps suggested in the below blog.

https://docs.microsoft.com/en-us/dynamics365/customer-engagement/outlook-app/dynamics-365-app-outlook-user-s-guide

Still I don't see the Dynamics 365 App for Outlook in my Outlook App.

Does anybody know the reason to this issue?

Or anybody ever faced this issue?

Thanks in advance for helping out.

Regards,

Parth Bhaidani