Adding variable to generic Message Box

I'm having issues with my AD Query. The AD Query agent expression is as such:

expr { [mcget {session.ad.last.attr.memberOf}] contains "Test.40.Employee" && [mcget {session.ad.last.authresult}] == 1 }

The AD Query isn't sending the user agents down the expected branch, so I'm trying to carry the defined variable into a generic message box to troubleshoot. In the generic message box, I added the below value:

AD Query variable %{session.ad.last.attr.memberOf}

However when I go through the VPE, the value is not displayed in the message box.

Any help on where I'm going wrong?