Teamviewer11 on Ubuntu 18.04 x64 is not able to login

On the screen of "Computers & Contacts", I got no response after inputting username, password and clicking the "Sign In", and I got the same result under the menu Connection->Setup unattended access where the password will be automatically cleared after entering username, password and clicking Next.

Does anybody know why? or is it related to my account privileges?
Thanks for advise in advance.

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