No undefined parameters in Orchestrator

Issue revolves around setting parameters in Orchestrator. I’m trying to run a very simple workflow that writes “Hello World!” into Notepad using the undefined argument “in_Message” (no default or assigned value). When I publish the workflow to Orchestrator, however, it does not allow me to define the parameter during the the start job process. Instead, it shows the following “parameter_collection_no_undefined parameters” even though the in_Message argument is definitely left undefined/empty.

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