Ever since Google started using two-step authentication, and people started using it, people using Windows Live Writer and Blogger have been running into problems with authentication. The base problem being that their normal Google email address and password are not working with Windows Live Writer.
Sadly, if you go to the Windows Live Writer support forum, the Microsoft technical support reps simply orientate you in the direction of Google. This always kind of makes me irritated. Microsoft knows what the problem is, and they know how to fix the problem.
People are coming to them with problems having to do with their software. They could take the time to explain what the problem is and then try to point them to the appropriate knowledge base support forum or something, but they blindly point people in the direction of Google and give them best wishes in fixing the problem. I think that's poor support