Do accessability standards require that every html page a main tag?

To meet accessability standards, should every page have a <main> tag? I've noticed that major websites sometimes use the <main> tag in their pages, and sometimes they do not. Do any of the major accessability standards dictate or suggest that every page should have a <main> tag? It seems to make sense, but I'm also not sure what the accessability consequences of not having one are.