Hi @Maggie Ladd
Good day to you and thanks for your post in Microsoft Q&A. I'm sorry for the inconvenience you've encountered.
I’m really sorry for any mix-up. Turns out the Shared Calendar app is created by Cherryware, not Microsoft, and I wish I’d made that clearer from the start. Please accept my apologize
The mirroring feature only works with calendars made inside the app, so it won’t play nice with your Outlook calendar just yet. I totally get how frustrating that must be, and I’d love for you to contact with the Cherryware team. They might have a solution or workaround up their sleeve. You can find contact information at Shared Calendar for Microsoft Teams
In the meantime, you can consider Share your calendar in Microsoft Teams. For more information please visit Share your calendar in Microsoft Teams - Microsoft Support
Thank you for your understanding and kindness
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