Below is a How To document I wrote for my work related knowledge base:
How to enable Google G Suite support in Microsoft Outlook 2016 for Mac Apple macOS computers equipped with Microsoft
Office 2016 now have the ability to sync Google G Suite account information in a more complete manner. This includes email, calendar (read/write), contacts and is similar to how Outlook interacts with Office 365.
1. Please note the following requirements in order to completely sync your Google account:
a. Update your Microsoft Office 2016 suite to the Office Insider Slow program
b. Have an Office 365 account
c. Enable 2-Step Verification on your Google account. This requires a smartphone (Android or iOS) that will be paired with your Google account as a second method of authenticating your identity. Respond to the Google prompt on your smartphone when adding your Google account.
2. On your macOS computer, launch Microsoft Outlook 2016. Previous versions of Outlook (2011 or older) must first be updated to version 2016, uninstall any previous versions after updating. Contact your IT support provider for assistance.
3. After Office 2016 is installed, launch Outlook and from the Outlook menu select About Outlook. Note it should say License Office 365 Subscription. If so, then skip to step 5.
4. If in step 3 you do not have an Office 365 license. You might need to delete your existing Office license and associate it with your Office 365 account.
a. Quit all Office 2016 applications.
b. Download, install and run the Microsoft_Office_2016_License_Removal_1.0 app.
c. Launch Outlook and the following window should open, click on the Sign In button.
d. Login with your Office 365 email address/password:
5. Update Outlook 2016 to the Office Insider Slow program
a. In Outlook 2016, from the Help menu select Check For Updates
b. Check the Join the Office Insider Program checkbox
c. From the Choose how you get Insider builds pulldown menu, select Office Insider Slow
d. Quit all running Office applications (Excel/Outlook/PowerPoint/Word) and click on the Check for Updates button.
6. Enable 2-Step Verification on your Google account by clicking the Get Started button on https://www.google.com/intl/en/landing/2step/
7. Launch Outlook 2016 and from the Tools menu select Accounts
a. In the lower left corner of the Accounts window click on the + button and select New Account from the contextual popup menu
b. Type your Google email address in the Set Up Your Email window and click on the Continue button
c. In the Setting up window click on the Continue button.
d. In the resulting browser window, sign in with your Google credentials or if you are already signed in, select your account
e. In the Sign in with Google window, click on the Allow button
f. Associate Outlook with Google email, calendars, etc. by checking the “Always open these types of links in the associated app” checkbox and click on the Open Microsoft Outlook button.
g. Click on the Done button.
8. Your Google email, calendars and contacts should now be available for you in Outlook. Note the Google icon.