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:-
where i defined the following values:-
- Outlokk web access URL =
- Exchnage web service URL =
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)
so can anyone advice on this error?