See your Google Calendar in Outlook - Microsoft Support
https://support.microsoft.com/en-us/office/see-your-google-calendar-in-outlook-c1dab514-0ad4-4811-824a-7d02c5e77126
WEBIf the File option appears, select the tab for Classic Outlook. In your Google Calendar account, select My Calendars and choose the vertical ellipsis ( ⋮) to the right of the calendar name. Switch to your Outlook calendar. Below the calendar grid on the left, select Add calendar, then select Subscribe from web.
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