Could you specify what exactly you're trying to do and which feature you're referring to? Are you expecting a contact to sync from Outlook Desktop to HubSpot or vice versa? If you could provide more detail as to which steps you took and what you'd like to achieve that would be helpful.
Best regards
Karsten Köhler HubSpot Freelancer | RevOps & CRM Consultant | Community Hall of Famer
Just adding to @karstenkoehler's point, there are two Outlook tools.
The Outlook Desktop Add-in, which allows you to track and log emails and use a number of HubSpot Sales Tools from within Outlook. And the Outlook Contact Sync, which allows you to sync contact between Outlook and HubSpot.