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Nintex Newbie

"Access denied" when using Call HTTP Web Service

Hi all,

I am using Call HTTP Web Service action to create a new SharePoint group. This is on SharePoint Online.

The script that uses jQuery via ajax call to "_api/web/sitegroups" works by itself when I put it directly in script web part but using the Call HTTP Web Service action in Nintex Workflow, I am getting error below.

"{"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."}}}"

It seems other people have experienced the same issue as posted below without a solution yet. Any ideas on what the problem is? thanks a lot. 

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