Meeting invitation are not being sent

When I create a new meeting no one of the participants gets in invitation. The calendar is synced over calDAV with my iCloud calendar.

have you checked the personal checkbox when creating a new meeting event, because that could be the cause.

Often it is the calendar server that sends the invitations, not eM Client.

With iCloud this is true. When the event is created and saved in the iCloud calendar, the iCloud server says it will send the invitations, so eM Client doesn’t send them.

You will need to contact iCloud and ask for assistance if they are not sending them.