Schumi, so... your app password seems to almost log you in? I thought those works just like your normal password^^ No real difference... (nor need to have the app to support it)
leecher, you didn't just recommend to turn a security feature off, did you? It's weird enough that you've never heard of it...
Today, 2-step auth is very common, Google started to use that, and other services followed. Such as battle.net and now even Microsoft... It's mainly used for its high security benefit.
You might even call Steam Guard a 2-step auth, even though it's not using an authenticator, nor required for all kinds of login.
Though, adding 2-step auth would be the best to do, those "application passwords" should work as well... So how about enabling it and try to use an app password so you could maybe "fix" it... Would be enough for now