When you get an error like this, when you try to open a Workflow that is in Draft mode, check first if you are using Custom Workflow Activities in that workflow and if the Custom Workflow is update with the most recent dll’s for the version of your Dynamics CRM instance.
I had a issue like that and updating the dll’s solved the problem.
Filed under: C#, Dynamics CRM Tagged: C#, Custom Workflow, Dynamics 365, Dynamics CRM, Invalid User Authorization

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