SharePoint Approved and Rejected buttons not appearing in task form in Visual Studio 2015 workflow
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Recently we were working in a visual studio 2015 workflow for SharePoint online sites. The workflow we have developed as a SharePoint hosted add-in. In that workflow, we have added a custom task content type which was inherited from the Workflow Task (SharePoint 2013) parent content type.
After the workflow deployment, we were checking to approve or reject few tasks. But we noticed the Approved and Rejected buttons are not appearing in the Edit task form. So we were not able to approve or reject the tasks. We can only see Save and Cancel button like below:

Approve Reject button disappears workflow task form
Solution:
When we do an analysis we found out that, for one of our requirement we were making the “% Complete” column as hidden. Ideally it is advised that “% Complete” and “Task Status” columns should not be hidden. So we make the “% Complete” column as Optional like below:

SharePoint online workflow task form approve reject button not appearing
After this we were able to see the “Approve” and “Reject” button properly like below:

visual studio 2015 workflow approve reject button not appearing
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Hopefully, this post may be helpful to solve SharePoint workflow task form approve reject button not appearing issue.

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