How To Sync Outlook Calendar With Google Calendar

Note: This method is impractical, especially since it takes 24-48 hours (or even longer) to update in Google. The only fix for this process is to remove the Outlook link in Google Calendar and add it again to update the synced Outlook Calendar.

Google Calendar Editable? Yes.
Outlook Calendar Editable? Yes.
Sync Speed: 24+ hours (varies depending on devices, internet, and refresh cycles)

If still interested in adding the Outlook ICS link to Google Calendar directly, do the following:

Open your Office 365 account in a browser.
Go to Outlook and click on Settings, then View All Outlook Settings.
Click on Calendar, then Shared Calendars.
In the Publish Calendar section, you can get the link you need.
Select Calendar, then Can view all details, and then click Publish.
Click on the ICS link (below the HTML link at the bottom) and choose “Copy” to use later in Google.
Once you’ve acquired your Outlook calendar link, it’s time to finish the synchronization. Open Google Calendar.
Tap on “+” next to “Other calendars” at the bottom of the page.
Now, click on From URL.
Paste the link saved and tap on Add calendar.
In the Other calendars section in the bottom left area, you’ll see your Outlook calendar that you can select. The sync process is now complete.
New changes take 24 hours or longer to update in Google Calendar, but it does work. As previously noted, you can remove the ICS link and add it as a new calendar to get updated Outlook data if you don’t want to wait so long.