To diagnose and resolve this issue the following will need to be confirmed?
e.g. If you try to Submit a Workflow for Approval and the following is displayed(No approvers found)., you will need to confirm if the workflow on the Idea Definition has stakeholder roles defined that will need to Approve it.
Added the Role on the Idea Stakeholders Sections and assigned the person who needs to approve for the Role:
After all the above steps have been completed, when you Submit the workflow again you will now get the following message (After Assigning the approver)
With all the above steps completed the person assigned to the Role, should approval request for the workflow via email.