Syncing your Google Calendar to Outlook
Open your Google Calendar calendar.google.com and click the settings cog / gear icon > Settings. Select the calendar you want to sync to Google in the left pane and select Integrate calendar
Scroll down to this section and copy the secret address
Open Outlook in a web browser outlook.office.com, click the Calendar icon, and select Add calendar
Select Subscribe from web and paste your 'Secret address' URL. Give your calendar a name, colour and icon and click Import