I am using a trial installation of Nintex Workflow 2013. For the Request Data action, on the ribbon, I do not have the option to edit the task form using InfoPath. For the Form Type dropdown in the action's configuration, I also do not have InfoPath as an option - only Default is available. Please see screenshot below.
I have already activated the Nintex Workflow 213 InfoPath Forms feature at the site collection level.
For the Assign Flexi Task action, I can see the Edit Task Form button on the ribbon, and the Form type dropdown allows me to select InfoPath.
How can I enable InfoPath form for the Request Data action?