Could not complete cross domain call-SharePoint Online Provider Hosted App

Question

HI Team,&nbsp;We have developed a form that writes data to a SharePoint Online List using Provider Hosted App MVC and deployed as an App part in SharePoint Online. But in few of the user machine we have notoced an typical error, which says - "This site says - Could not complete Cross Domain Call". The issue is the same with all the browsers. We believe there are some machine specific restrictions that is blocking the calls.Can you please help us &nbsp;in understanding and resolving this issue. PFA, image for the same.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Regards,Sivapratap.

kevmcdonk · Answer

Have you looked at the cross domain library? https://dev.office.com/sharepoint/docs/sp-add-ins/access-sharepoint-data-from-add-ins-using-the-cross-domain-library

sivapratap kurapati · Answer

Hi Kevin,&nbsp;But this issue is not with all user machines, only specific users are facing this problem. Is there a workaround from browser perspective to resolve this ??&nbsp;Regards,Sivapratap,

kevmcdonk · Answer

In which case it's worth checking what zone each of the site domains is in I.e. The SharePoint site and the provider hosted app.

sivapratap kurapati · Answer

Hi kevin,&nbsp;Is there a way we can recreate the same issue in development environment and check on it?&nbsp;Regards,Sivapratap.

sivapratap kurapati · Answer

Hi Kevin,&nbsp;I was able to recreate the issue, by click on "Block" third party cookies in Internet OPtions &gt; Privacy &gt; Advanced. But the strange behavior is on the user machine even though he clicks on "Accepts" still he is facing the cross domain issue.&nbsp;&nbsp;One more thing what i observer in his machine is - when webappproxy gets triggered from his client , it throws "Access Denied" message. Any idea why this is thrown ?&nbsp;https://contaso.com/sites/testsite/testportal/_layouts/15/AppWebProxy.aspx?SP.CloseWindow=true&nbsp;the above link throws "Access Denied" message in the user machine.&nbsp;&nbsp;

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Could not complete cross domain call-SharePoint Online Provider Hosted App

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