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Other than that, the only D4 error codes I could find that start with 400 are
ERROR_40014 = Sorry, you can not proceed until you pass real-name verification. Learn more (|HURL:https://www.battlenet.com.cn/support/zh/article/210633|hhttps://www.battlenet.com.cn/support/zh/article/210633|h)
ERROR_40011 = You can’t login due to regulatory minor game time restrictions. Please be advised to keep a balanced and healthy lifestyle while playing video games. Learn more (|HURL:https://www.battlenet.com.cn/support/zh/article/210633|hhttps://www.battlenet.com.cn/support/zh/article/210633|h)
ERROR_40012 = You can’t login due to regulatory minor game time restrictions. Please be advised to keep a balanced and healthy lifestyle while playing video games. Learn more (|HURL:https://www.battlenet.com.cn/support/zh/article/210633|hhttps://www.battlenet.com.cn/support/zh/article/210633|h)
So maybe this helps, checking your Bnet account settings (you still need if you buy the game via steam) regarding verification or parental controls (both Bnet and Steam).
[Edith says]
The general error code 400 is a HTTP "bad request" response from a server, meaning it cannot/willnot process a client's request due to a problem within the clients request.
Again, maybe some more information if this does not help.
Btw. all info aquired with a simple google search in a couple of mins, just for future reference...