Cant play Zero Hour anymore

When I started the game as usual a few days ago, I got prompted to "Sign in with my Origin Account to activate Zero Hour on this computer." 

See the screenshot attached.

I entered my login and pwd and got the error: Invalit email or password.

I went to the origin website and logged in with my credentials just fine. Tried again in the prompt windows, but again error. Changed password, but no effect. When I click on "forgot password" it says that my computer is not connected to the internet, which is not true. 

Any ideas?