Linking events from a calendar (Outlook Calendar)
Your Google account must be connected to Jira and the Outlook Calendar integration must be enabled.
You can link events to a Jira issue by selecting them from a calendar.
To link events to a Jira issue from a calendar:
Click the + Add Event button.
In the window that appears, click Link from calendar.
Use the Calendar dropdown to select the calendar you want to link events from. Then, select a highlighted date to display that date’s events.
You can use the dropdown under Calendar to change the calendar you want to link events from.
Select the event(s) you want to link to the issue, then click Link.
The selected event(s) will appear in the Jira issue.

Users will only be able to access calendar events that their Microsoft account has the right permissions for. See the Outlook Calendar integration FAQ for more information.