reading error

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reading error

I'm trying to communicate with a meter ( Elster themis-uno EI6) in DLMSDirector.
With authentication "none" I have some response, but i can't reach obis for current index and many other needed.
Using authentication "none" and at the tab secure connection using "encryption" , system tile ( client system tile for management 8 bytes) , block cipher and authentication key same hex code for this specific meter , I get an error "Connection is permanently rejected . Authentication failure"

Can you help me with some info in order to get all the data from obis?
I want to mention that, meter name( series) and only one key(hex) is use in meter tools software and there I have access to all obis.
thank you