That's correct - I'm not creating, deleting or renaming a calendar. I'm simply attempting to add a new permission to an existing calendar. It's a private calendar.
Here are the steps to duplicate:
1. In the list of calendars, I'm selecting the one I want to update. It's titled "Stake PEC (private)". NOTE: I know grammatically the period should be inside the quote, but I want to make it clear that the period is NOT part of the name.
2. I click on "Add new permission."
3. In the search box I enter and select the name of the calling "Stake Assistant Executive Secretary" and make sure the corresponding drop-down has "By calling" selected.
4. I set the Permissions to "View and Edit," then click the "Add" button.
5. I verify that the new permission is included in the list, then click on "Save." At this point I get the error, "Sorry, you must correct the highlighted areas before you can save. The name of the calendar is required to be unique." The "Name" field is highlighted in red, but the name is exactly like it was before — "Stake PEC (private)".
6. I've tried saving it to other names, like "Stake PEC" and "Stake PEC - testing", but I get the same results. I also checked the "Deleted Calendars" list to see if there was anything there that could be causing a conflict, but the list is empty.
I'm sure the work-around is to create a new calendar and delete the one causing me grief, which I'll likely end up doing, but I'd sure like to understand why it's behaving the way it is with the current calendar.