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Validation of SAML bearer token failed: 12.

  • 1.  Validation of SAML bearer token failed: 12.

    Posted Apr 21, 2025 03:49 AM

    Hi all,

    I'm encountering an issue with guest authentication on Linux VMs using Open VMware Tools. When attempting operations that require guest authentication, I receive the following error:

    Validation of SAML bearer token failed: 12.

    This issue happens only with Linux guests - Windows VMs work flawlessly out of the box, with no additional configuration required.

    My goal is to enable Credential Less authentication on RHEL 8 and later versions. However, I'm not sure what specific steps are required on the Linux side to support this. In particular, I'm unclear whether a local user must be manually created, and if so, how it should be associated with the self-signed certificate used by vCenter.

    Has anyone encountered this issue and found a solution or workaround for Linux environments?

    Thanks in advance for any help!