Solved
I am a Korean teacher, I've been used geogebra in class.
When I login, I've got a follow message :'this user has been banned by our automatic checking system'
id : <removed>
I have a lot of content in this account.
Please, I look forward to the right solution.
The same problem 
Sorry, please try now!
Thank you very much.
I checked in the morning.
I'm glad you can use it in class.
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