We have rare cases where yasoon does not appear as expected. We are aware of this issue and provide a workaround. However, we kindly ask you to contact our support team at firstname.lastname@example.org so we can fix this issue in the near-term.
Use the Outlook Menu File --> yasoon to open our support settings.
Change yasoon appearance to Ribbon Menu (top) .
Now yasoon is available as ribbon in your Outlook toolbar: