title: Connecting two firebase auth with one project
body: <p>I'm making two apps App1 &amp; App2 wich they share the same firebase database, but when user register with an email he can't register with it in App2, I got "email already exists".</p>
  
  <p>How can I seperate these two projects and share the the same database and the user still register with the same email in the two apps ?</p>