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I am working on a SharePoint online team site collection inside Office 365. now i added a sharepoint calendar, then i chose to overlay it with exchnage as follow:-

enter image description here

where i defined the following values:-

  • Outlokk web access URL = https://mail.****.com/owa/
  • Exchnage web service URL = https://mail.****.com/ews/exchange.asmx

but when i access the sharepoint calender i got this error:-

The HTTP request is unauthorized with client authentication scheme 'Ntlm'. The authentication header received from the server was 'Negotiate,NTLM'. (e8855c9e-6056-5000-892f-f2f4a5b97961)

as follow:-

enter image description here

so can anyone advice on this error?

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I can reproduce your issue.

This issue occurs because the ability to use the calendar overlay in a SharePoint Online or SharePoint Server calendar that is retrieved from Exchange Online isn't supported.

Refer to: https://support.microsoft.com/en-us/help/2997170/the-http-request-is-unauthorized-error-in-a-sharepoint-calendar

  • thanks for the reply, now i already read the above link, but seems the error i am receiving is not 100% similar to the error mentioned inside the link.. or they fall under the same category that This issue occurs because the ability to use the calendar overlay in a SharePoint Online or SharePoint Server calendar that is retrieved from Exchange Online isn't supported. ?? – john Gu Apr 12 '18 at 13:13
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    Yes. SharePoint Online doesn't support Calendar overlay with Exchange web service. – JoannaW_MSFT Apr 13 '18 at 7:59

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