For some reason today, Messenger didn't log me in automatically and asked for my password. 

When I entered this, it didn't recognise it.   I have changed it 4 or 5 times this morning but Messenger still doesn't recognise it and is showing an error code of 80048821.  Why is this?

This has happened several times before although I have eventually managed to sign in - somehow! - before now, but not today.  I can access Messenger from the Microsoft page but casnnot go not directly into Messenger itself, which is SO much simpler.