adding alternative hosts creates a duplicate meeting at same time- what am i doing wrong?

Hi wilcoxk,

Adding an alternative host should not create a duplicate meeting. Is this showing the duplicate meeting in your Upcoming meeting list? If possible, could you provide a screenshot of what you're seeing? Please be sure to blur out any personal information. Thank you!

We use MS Outlook 365 for calendars, etc.  I do not have permissions for her calendar.

Thank you for your help.

Are you looking at both her and your calendar at the same time? If so, it will show up in both your calendar and hers, even though it's the same event.