Can an administrator connect calendars for everyone?

Microsoft 365 can be connected once for a set of email domains, from App Settings > Global Integrations.

Google Workspace can also be connected once for the whole site (beta), by a Jira admin under Administration > Global Integrations; otherwise each user connects their own Google Calendar.

Related pages

• Microsoft Outlook Integration - where this is covered in full.

• Calendar Integrations - more questions on this topic.