The IT department is deploying new computers. To ease the transition, users will be allowed to access their old and new systems. The help desk is receive reports that users are experiencing the…

Permission issues would typically cause errors related to specific resource access denials after logon, not a failure at the authentication/logon stage itself.

Access violations refer to unauthorized attempts to access restricted memory or resources at the OS/application level, not an authentication failure during the logon process.

When organizations deploy new computers, user certificates or smart card certificates may be updated or re-issued, causing the old system to fail authentication because it cannot validate the new certificate chain or the old certificate has been superseded. Certificate-based authentication failures manifest as 'Logon Failure: Access Denied' because the credential presented cannot be verified, even though the user's account and permissions are otherwise intact. This is a known issue in environments using PKI or smart card logon during hardware refresh cycles.

Misconfigured devices could cause connectivity or policy issues, but in the context of a system transition with this specific logon error, it does not directly explain why existing user credentials fail on the old system.