Hi. I wish you had shown your solution to the problem so that someone could benefit from the answer later. I tackled the same problem today with the advice by Joshua from Mathworks Support Team. Thanks for his help. The following steps and suggestions are also useful for error -9.
The first one is a delay in MATLAB receiving the request. You could wait more than 8 hours.
One of the reasons behind that error is a Windows user name that is not only ASCII characters.
For Windows 10 users, in order to activate MATLAB you need to change your user name to be all ASCII characters. But we know that the Windows need your e-mail or other contacts also. If you want to change your own Windows account name, you should first check your own username by typing the Windows key and cmd.
windows+r enter cmd
Then enter "set username", and you will find your username.
Start menu -> enter Windows Powershell( Open as Administrator)
Enter
Rename-LocalUser -Name "Current Name" -NewName "New Name"
Source of instructions : https://www.top-password.com/blog/6-ways-to-change-user-account-name-in-windows-10/
It is sad to find the powerful MATLAB only supports ASCII characters. I hope it will become more advanced.
