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My problem is exactly described in the question below, but has no accepted, or helpful answer.

Most answers mention Office 365, which might work, but I am looking at a 2013 setup.

How to start SharePoint Workflow programmatically using CSOM

I'm running on SP Server 2013 and trying to do some workflow operations through CSOM but I keep getting null at the GetWorkflowDeploymentService call

WorkflowDeploymentService workflowDeploymentService = workflowServicesManager.GetWorkflowDeploymentService();

Unhandled Exception: Microsoft.SharePoint.Client.ServerException: Cannot invoke method or retrieve property from null object. Object returned by the following call stack is null. "GetWorkflowDeploymentService new Microsoft.SharePoint.WorkflowServices.WorkflowServicesManager() "

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This is probably a permissions issue, try changing the user permissions to design on both site and site collection

  • account is site collection administrator – Tiago Duarte Aug 27 at 14:00

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