Convert to AppIntent from Siri Intent not recognizing new handler class

Question

I'm trying to convert a Siri Intent (written in Obj-C, don't think it's relevant, but better to say it) to App Intent. I used the button Convert to App Intent, I refactored the code writing it in Swift. When I test the Intent runnning it with the Shortcuts app, I receive the Unimplemented response, even if the code seems to run in some way (the dialog is displayed and the code seems to do the trick).