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The problem indicated by the error message "KDC reply did not match expectations" is that the Kerberos Ticket-Granting Ticket (TGT) that was received by Realmd during the process of joining the domain does not match the expected format or contents. This may be due to a misconfiguration or a compatibility issue between the client and server components of the Kerberos protocol, or it may indicate an authentication failure caused by incorrect or outdated credentials.