Hi Burce Matute Gunes,
Thank you for posting in the Microsoft Community Forums.
The level of log detail in Windows' Event Viewer may not be set to display the full logon failure message. You can try changing the properties of the event log to capture more detailed information.
In the Event Viewer, you may need to filter or view specific security logs to find detailed information about failed login attempts. Typically, failed logon events can be found under Windows Logs > Security.
If the logs on the DC do not provide enough information, you may need to check the logs on the workstation where the logon attempt was made. The local security log on the workstation may contain more detailed information about the failed logon attempt.
The Windows audit policy determines which events are logged. If the audit policy is not properly configured, then important failed logon events may not be logged. You can check and adjust the local security policy for your domain or workstation to ensure that all relevant failed logon events are logged.
Best regards
Neuvi Jiang