How do I check Okta's System Logs to diagnose the 'logonuser failed with error code 1326' error?

In the Okta Admin Console, navigate to the System Log. Filter the logs by the user's username or email and the error code '1326'. Examine the logs for the source of the authentication failure (e.g., a specific application or a direct Okta login). The logs may also show the specific reason for the failure, such as 'invalid username' or other related error messages that offer hints.