When I open minecraft on my switch an image appears saying that the Automatic sign-in has failed, and that I need to manually sign in again. But when I try to sign in it says 'Save to Microsoft account', or 'leave on device. If I click on save to Microsoft account nothing happens, but when I click on leave on device it closes that window.. 

Pls fix this because otherwise I can't access my worlds that I've played on.