SharePoint Integration Error

Hi All,

I have created Share Point integration in  Appian 19.4, It is giving me the below error but when with the same configuration I  created in Appian 19.3 it is working fine.

URL :{site url}_api/web/GetFolderByServerRelativePath(decodedurl='Documents')?$select=Folders,Files&$expand=Folders/ListItemAllFields,Files/ListItemAllFields.

Error: 

error-result-label

SharePoint returned a 403 HTTP error

error-result-guidance

SharePoint returned the following error code: -2147024891, System.UnauthorizedAccessException Access denied. You do not have permission to perform this action or access this resource.

Response:

 "{ "error" : { "code" : "-2147024891, System.UnauthorizedAccessException", "message" : { "lang" : "en-US", "value" : "Access denied. You do not have permission to perform this action or access this resource." } } }"

If anyone can help me it will be very helpful.

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