From this morning only, didn't have the problem occuring yesterday, i've had the security proof box appear on my xbox at log in. Upon filling in the correct details for account and password that i'm using on this account i get error code 80048821 saying that my password is incorrect or my email doesn't have a membership. However i know that both are indeed correct.
If i select the OK button at the box it takes me back to the beginning again and it does the same thing if "remember password" is selected or unselected. I would greatly appreciate any help in removing this error code and glitch.