found a solution: the revpi had a Authenticaton yes in the sshd config file, I changed it back, then connection was possible

I took over the revolution pi from a colleague, which is not in the company any more and face problems @log in:
He told me to use a console and ssh pi@10.0.0.90, then enter the password.
But the console sends back pi@10.0.0.90: Permission denied (publickey).
I cannot even enter the password?
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