Launching Intercom messenger when the "Contact" button is pressed

Site url: https://www.omegareflector.com/

Hi there,

I've installed Intercom on my website and the messenger widget is located at the bottom right corner of each page.  I'm trying to make it so that when anyone clicks on the "Contact" link in the header, it launches the Intercom messenger box. Any ideas? Thanks! 

Can you add Intercom again? It shows nothing to me

When you've added it, you can add this code to Settings > Developer Tools > Code Injection > Footer

<script>

  document.querySelector('header#header a[href*="mailto"]').addEventListener("click", ()=>{

  Intercom("show")

})

</script>

@tuanphan - Thanks for your reply! I never removed Intercom - you should still be able to see it down in the bottom right corner. (Screenshot below). I did enter that code and it worked - thank you! It did open both email and show intercom. Is it possible to ONLY have the intercom messenger window open? And not launch an email? I really appreciate your help!
-Melissa

It is strange, Intercom doesn't show here, maybe it blocks my country.. can you do a quick video of problem?