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I wonder if you could also check the security on the datastore. It's possible that its permissions are set to be too restrictive; from what I read Appian always defaults to only System Admins being able to read and write to datastores (other responders please correct me if I'm wrong).
You can "run as" someone who does have the proper rights in this process model, but you'll have to keep doing it over and over every time you need to use it in future development, or you could just update permissions properly once on the datastore itself.
Provided, of course, that this is what the issue even is.
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