Getting bellow error however edited the flow and checked the step is already completed as per instructions.
5 answers
Finally was able to resolve this. Looks like while creating. Looks like while creating the Action Element even though the Label correctly entered as was Submit Position for Approval for some reason the API name was defaulting to Submit and the validation was looking for the API name as Submit_Position_for Approval instead of just Submit.
Edited the API name and it successfully marked as compete.
Thanks!