Why don't you hand sign your emails?

For the last few weeks I’ve used a manually generated ID to get into work rather than using the ID scanner and today the secretary had enough.
Her: “Why don’t you have an ID? I have to make you a new one everyday.”
Me: “I emailed the form to security.”
Her: “Did you get it signed by your manager?”
Me: “No, it’s an electronic doc.”
Her: “Well that’s the problem. ¬†Your manager needs to sign it.”
Me: “How?”
Her: *Eye roll*
Me: (Wishing I could shoot laser beams from my eyes but smiling) “Okay, I’m sorry, I’ll get the electronic copy of the PDF signed by my manager.”
Her: Thank you.