I have a problem with the Web Service call to add a user to a SharePoint group. I am getting Forbidden error when the workflow goes to HTTPcall step.

I have followed this link to create the workflow-http://codelesssharepointinfopath.com/workflow-useful-rest-calls-add-user-to-group/

Screenshot of the workflow

Posting below the responses which I got on the email:

Meta: {"type":"SP.User"}
Params: {"__metadata":{"type":"SP.User"},"LoginName":"i:0#.f|membership|xxx@zzz.com"} Request Header: {"Accept":"application/json;odata=verbose","Content- Type":"application/json;odata=verbose","Authorization":""} Response Code: Forbidden 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."}}}

Note : I am selecting a List field(Person or Group) value for LoginName.

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