How do I go about reopening a closed case for review from the Case Manager portal? That is, a case that has been worked on and completed by an operator.

Currently I have a table displaying a list of closed cases:

I am attempting to configure the "Riapri" button to reopen the closed case through the following action set: Click > Open Assignment [.pzInsKey] (passing the key for the case)

When trying this out, I get the following error:

Thank you in advance for your help.