This video will show how to sync your G Suite or Gmail Account with Apple Mail, Contacts and Calendar on a Mac. https://www.youtube.com/watch?v=TP1GPF7bTi8
Step 1: Check that IMAP is turned on
On your computer, open Gmail.
In the top right, click Settings Gear.
Click the Forwarding and POP/IMAP tab.
In the "IMAP Access" section, select Enable IMAP.
Click Save Changes.
More info on Step 1 can be found at https://support.google.com/mail/answer/7126229
Step 2: Synchronizing mail, contacts, and calendar simultaneously
- On the Mac Computer Open Apple Mail.
- Select Google and click Continue.
- Enter your name, full email address, and password, and click Set Up.
Select the services you'd like to sync, such as Mail, Contacts, or Calendar, and click Done.
For the most up to date info check out this Google Support Article: https://support.google.com/a/answer/1366863?hl=en
NOTE: We've noticed that Mail users tend to exceed our IMAP bandwidth limits more often than those who use another desktop client such as Thunderbird® or Sparrow. If you notice similar issues, please try synchronizing your mail using another desktop client.
G Suite Admins ensure that POP/IMAP is enabled for your users for more info visit https://support.google.com/a/answer/105694?hl=en