Updating Zoom Meeting information by a delegate does not update on synced Outlook calendar

We have a secretary who is a delegate for a managing partner. When she creates a Zoom meeting for him, and then goes back into the appt. to update it - adding add'l participants, changing the date, etc., the updated information/participant disappears shortly thereafter!  The added participants are never invited, and the updated information is never updated. Has anyone else experienced this? Any fixes for this? We have an open ticket with Zoom tier 2.  Thanks!