Hi Romano, (Fabrizio) ,
From the experiencing an issue with the SharePoint Online Linked Service connection on Azure Data Factory.
You need to provide the App permission to Sharepoint on site level. You might have given SharePoint Online site permission to the registered application for the main site, but probably not for the subsite.
If you have Admin access to Sharepoint then you can provide access to Service Principal
If you need to do if programmatically then you can use below XML: <AppPermissionRequests AllowAppOnlyPolicy="true"> <AppPermissionRequest Scope="http://xxxxxxx" Right="Read" /> </AppPermissionRequests>
The other possible reason could be that the particular site has been moved under a private network. Kindly check the same, in case it is so, then you need to use Self hosted IR insted of Autoresolve integration runtime.
Hope it helps. Kindly let us know how it goes. Thankyou