This article resolves the error message below, when trying to add a Shared Calendar
1. Open Outlook and go to File > Account Settings > Account settings
2. Email tab > click on your email address > click Change...
3. Click More Settings
4. Advanced tab > uncheck Turn on shared calendar improvements > click Apply
5. Close and reopen Outlook
Related Links:
- How to add a Shared Calendar - https://smolin.freshservice.com/support/solutions/articles/4000058605
- Change Calendar Permissions - https://smolin.freshservice.com/support/solutions/articles/4000058606