Data backup if the screen is broken and black

Dear users, I am desperate!
I have a Huawei P9 Lite Mini. The screen is broken and black, is impossible to interact and nothing appears. The device is not in debug mode. I can not interact and confirm on the popup which usually appears during the use of the most common data recovery software. How can I recover all data inside my phone?

1) I already tried all recovery software as Dr. Fone, Mobilke go and so on (I cannot confirm on popup on device);
2) I already tried OTC Cable but nothing happens;
3) The device has not root power;
4) Obviously, without any interaction, is impossible to activate the debug mode;

I also tried "adb", but by "adb devices" in command line the device appears as "unauthorized"; maybe this is the good way? How can I see my device in the terminal list, but as authorised?

Thank you very much, for me is a real emergency!

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