Hi - I am having the same issue as Brandon. As he mentioned, we have already successfully gone through the steps of adding a new calendar via ICS URL. The issue is that now when a calendar event in Outlook gets updated or added, those updates do not reflect in the Google Calendar. For example, a meeting I was supposed to have today got moved to Friday, however the Google Calendar still shows the meeting has happening today even though I've accepted the updated meeting invite in Outlook.
Any advice on how to fix this sync issue would be appreciated as it's very frustrating and I haven't been able to find a straight answer in any Q&A forum.
I was having this issue as well. My Google calendar had been syncing with my Outlook calendar and then stopped a couple of weeks ago. Go into your Google calendar and hit the three lines on the top left. Scroll down and see if your Outlook calendar is listed underneath your gmail account address below Events, Tasks and Reminders. If it is, you should be able to select it and then your Outlook events should show up on your Google calendar. Hope that helps!