Hey Diogo,
I actually just made an instructional video about this last week. I was having the same problem. Long story short, DO NOT set up the setting in the Inbound Email account. ONLY set up the settings in the AOP settings. If you set it up in both places, you will get two emails and the email generated from the inbound email settings does not work and does not insert the variables properly. Just disable it. Here’s a walkthrough video and my settings are visible: