This user has an Office 365 Kiosk license. Kiosk licenses allow users to access their email via Outlook on the web or smartphones, ...

This user has an Office 365 Kiosk license. Kiosk licenses allow users to access their email via Outlook on the web or smartphones, but not Outlook desktop (the article Office 365 for business Kiosk plans shows information on kiosk license plans). To enable Outlook desktop for this account upgrade it to a license that supports Outlook desktop. Available license plans can be found in the article Exchange Online with Office 365.