"Unable to find specified web in the given URL" when you use a calendar overlay
Problem
Consider the following scenario:
You browse to a Microsoft SharePoint Online calendar.
You click the CALENDAR tab and then click Calendars Overlay.
On the Calendar Overlay Settings page, you click New Calendar.
You enter the URL of a SharePoint Online calendar in the Web URL field.
You click Resolve.
In this scenario, you receive the following error message:
Unable to find specified web in the given URL.
Solution
This issue occurs because calendar overlays from one SharePoint Online site collection to another aren't supported.
More information
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