I had the same problem. Website would switch back to Chinese, and when I tried to go back to English I got the home screen or server busy (in Chinese). I finally just let it stay in Chinese and matched the fields with the English screen shot in the TWRP thread and I got through it and got the code. Have another problem with my phone's boot loader but that's for another thread.
The EMUI unlock site seemed down for me. I found that it was only down for the en language.
If you get the 600 error, try changing your language to chinese. I know it's a pain, but have the google translate plugin installed and I was able to progress quick enough through the dialogs to successfully get the unlock code for my phone.
Also, there's another guide in this forum that contains an alternate (paid) method. Search it out if you can't get anything else to work.
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