While you use Outlook on the web (OWA) and are trying the new (modern) Outlook experience, the KanBo Outlook Add-in won't be visible in the email section as it was in the old Outlook Online experience.
The icon in the old Outlook experience was located in the place where the arrow is pointing.
The Outlook Add-in might be visible only when you select more (...) button and then, KanBo Outlook Add-in.
To bring back the Outlook Add-in and have it in the same place as in the older Outlook Experience, please do the following.
1.Go to Outlook Settings.
2. Now select View all Outlook settings on the bottom.
3. In settings, go to Email -> Customise actions.
4. In Message surface, select the KanBo Outlook Add-in so it will appear on every message.
5. Click Save.
6. Now KanBo Outlook Add-in will be visible near actions buttons of every email message.
Customer support service by UserEcho