As you know, one of the things I enjoy doing in my lab, is to break things, and once they are broken enough, I start fixing them up. Sound quite masochist but that is one of the great ways to learn.
So, I was trying to break the relationship between an account in my on-premise environment and my Azure AD and try to re-establish it. However, it is not simple as I expected because you cannot do this in a proper way. Here is what I did to break everything and eventually fix them up.