Team Calendars for Confluence cannot be edited by a user who have permission
One or more users are unable to add events on a calendar, even when they have the edit permission.
The cause of this behaviour is still unknown.
At the present moment this behaviour was reported on Team Calendars for Confluence on version 4.0.3 or previous and by upgrading the plugin to version 220.127.116.11 (or latest) the problem got fixed, we also raised - TEAMCAL-2037Getting issue details... STATUS for tracking purpose.