When adding SharePoint calendars to be viewed via the My Planner Web Part you may receive an 'Error 401 Unauthorised'

The My Planner web part which ships with the Microsoft Learning Gateway Refresh package allows you to display your Exchange calendar and also SharePoint Calendars such as a school calendar or staff calendar,

To ensure that SharePoint calendars can be viewed by the 'My Planner' web part do the following:

• Go to Central Administration, Application Management
• Under 'Application Security' go to 'Authentication Providers'
• Select the Web Application that hosts the School Site
• Under 'IIS Authentication Settings' clear the 'Integrated Windows Authentication' check box and select the 'Basic Authentication' check box

This process is not mentioned in the deployment guide.