When I was going to login for multiplayer they asked for my email and password. I couldn't sign in.
I thought that something was wrong so I signed in minecraft.net then I realised that I can only sign in with my username.
So I was happy but when I was signing in for multiplayer they said type valid email address.
Please do this to help me and others who have experienced this by:
1. Letting us sign in with our usernames and not just email addresses.
And that's it.
BY The Way my mojang username is daniyalkhan2000