invalid token

The invalid token tag on WindowsForum.com collects discussion of authentication failures where Windows reports that a supplied token is invalid. The tagged content centers on Remote Desktop Connection (RDP) errors appearing after Windows 11 security and cumulative updates, including the message "An authentication error has occurred. The token supplied to the function is invalid." Reports describe the problem surfacing on Dell laptops following specific KB updates, with the issue traced to systems that had installed those patches. The thread covers the symptoms, affected builds, and the troubleshooting steps administrators use when token-based authentication breaks after updating.