Xiaomi AX3200 generated key from python not accepted on login

Hi folks,
I bought in Europe a XiaomiAx3200 model RB01 with open telnet. Install procedure seems quit clear but i'm stuck on telnet login. The system won't accept my login on telnet with incorrect login. I tested
root, admin, administrator as username
key from python, Wlan password, SN° as password

any messages for this topic?
pls advice
greetings aplrapid