If you would like conference room and desk reservations made in Tactic to appear on your Outlook calendar, just follow the next couple of steps to get your account set up.
Navigate to Tactic and click on the "Get Started" button next to the Outlook icon in Tactic under Settings -> Apps & Integrations.
After logging into Tactic, it will direct you to the Microsoft authentication view.
Enter your Microsoft email and password, then select "Accept" so that Tactic can connect with your Outlook account.
Once you've done this, you will be notified that you've successfully authenticated Microsoft with Tactic. Now that this is done, each conference room and desk reservation you create will show up on your Outlook calendar!