Google Calendar integration step 5 – ‘Calendar ID’

Omnivo’s instructions
(https://mysite/wp-admin/admin.php?page=omnivo_calendar_admin_page_google_calendar)
fail at the end of step 5:

… from ‘IAM & admin’ menu select the ‘Service accounts’ option . Now just look for ‘Email’ column in service accounts list . In ‘Calendar settings’ please check ‘Integrate Calendar’ section copy the ‘Calendar ID’ value.

There is no “calendar settings”, either before or after clicking the hyperlinked email column. There is no “integrate calendar” section, and no “calendar ID”. There are “unique id” and “key id”. If I go back to Google Calendar’s settings, I see “Calendar ID”, but that is different from both the “unique ID” and the “key ID”.

Which of these three should I use?

Below is the url of where I am when I get stuck:
https://console.developers.google.com/iam-admin/serviceaccounts/details/%5B%5B%5Bmy-unique-id%5D%5D%5D?folder=&organizationId=&project=dance-orangeville-calendar&supportedpurview=project

Thanks