Login failed in campaign?

Getting a message that my login failed if I try to click on campaign mode. My PC is definitely online, my serial number is valid (it says so at least), and I don’t have a firewall.

Any idea what is going on? Thanks in advance!

Well, I tried it on my desktop too, and it doesn’t work on that either. Same error. Again, I have no firewall, I’m connected to the internet, and the game says I have a valid code.

Any help at all?

That is strange - a valid key and yet you cant access the campaign mode
Question: can you see the online challanges ?

No, it doesn’t look like it. It comes up as a blank screen.

you always have a firewall its comes with windows and its part of the core programing

I’d just like to have some idea of why it isn’t working and possibly how to fix it.