DLMS encrypted DSMR Sagemcom T210-d

I´m new in HA and just got a Sagemcom T210-d which I´d like to integrate. In Austria it seems that data is DLMS encrypted. I already ordered the key at the provider but how do I have to do the integration?
I really have no idea… I found many solutions for DSMR but all without DLMS.
please help…
thanks
Stefan

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Same here (I also have the keys), only with Iskra AM550.
Did you find any solution yet?

sorry, I didn´t get the key so I installed a shelly 3EM which works great and is easy to install.

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