Go to Google Analytics account: https://analytics.google.com/analytics/web/. Click on "Admin" => "View Settings" and copy "View ID" number, then go to /admin/settings/general and tab "Google Analytics" and paste to field View ID.
Open JSON credentials file and copy client email. Then click on "User management" and add that email to list account. Just need view only permission.
Give your comment here if you got any problem.
Good luck!