Knox Service Plugin KPE Premium license fails with ERROR_INVALID_BINDING or ERROR_INVALID_LICENSE on Esper-managed Samsung devices

Android

KSP KPE Premium license rejected on Esper-managed Samsung devices — ERROR_INVALID_BINDING or ERROR_INVALID_LICENSE

When configuring Knox Service Plugin (KSP) on an Esper-managed Samsung device, the KPE Premium license key is rejected with ERROR_INVALID_BINDING or ERROR_INVALID_LICENSE, and KPE Premium policies fail to apply.

Why this happens

Samsung Knox licenses are cryptographically bound to a specific app package at the time they are created in the Samsung Knox Developer Portal. Because your KPE Premium key is bound to your own package ID — not to the Esper Agent — Knox rejects it when the Esper Agent attempts to use it. Separately, the ${esper.knoxKey} placeholder is Esper's internal Knox key used for baseline MDM trust; it does not substitute into the KSP kpePremiumLicenseKey managed configuration field and is not scoped to unlock KPE Premium services for third-party KSP configurations.

Step 1 — Confirm whether KPE Premium is actually required

1. Review the Samsung Knox Service Plugin documentation to identify which specific parameters require KPE Premium activation. Many KSP policies work under the standard (non-Premium) tier and do not require a Premium key at all.
2. Note the exact parameter names you need. If none of them require KPE Premium, proceed to Step 2. If they do require KPE Premium, skip to If KPE Premium is required.

Step 2 — Configure KSP using only non-Premium parameters

1. In the Esper Console, go to Apps & Configuration → App Library and locate Knox Service Plugin.
2. Select the app, then open Managed Configurations.
3. Configure only the parameters that do not require KPE Premium activation.
4. Leave the kpePremiumLicenseKey field blank. Entering a bound key or the ${esper.knoxKey} placeholder here will produce license errors.
5. Save the configuration and apply it to the target Blueprint or device group.

Step 3 — Confirm KSP is set to Managed mode

1. In the Esper Console, go to Blueprints and open the blueprint applied to your devices.
2. Locate Knox Service Plugin under the Apps section and confirm its install type is set to Managed. Unmanaged installs do not receive managed configurations, which will cause all KSP settings to silently fail.
3. Save and republish the blueprint if you make any changes.

Step 4 — Verify KSP policy application on the device

1. On the device, open the Knox Service Plugin app and navigate to Debug.
2. Review the status of each configured field. Successfully applied non-Premium parameters show an [OK] status.

Verify: All non-Premium KSP parameters you configured display [OK] in the KSP Debug screen within a few minutes of the blueprint being applied. Parameters that genuinely require KPE Premium will continue to show error codes until a platform-level solution is available.

If KPE Premium is required

There is currently no supported method to use a self-issued KPE Premium license key or the ${esper.knoxKey} placeholder to unlock KPE Premium features via KSP on Esper-managed devices.

If your use case requires KPE Premium KSP functionality, contact Esper Support to submit a feature request. Include the following information so the request can be evaluated:

• The specific KSP parameters or fields you need
• The Knox license tier you own
• Your device models and Android versions
• Your business use case and the impact of this limitation

If this doesn't resolve it

If non-Premium KSP settings are also failing to apply after confirming Managed mode and blueprint deployment, contact Esper Support with the following:

• The full KSP Debug screen output from the device
• Device model and Android version
• A description of the managed configuration fields you are attempting to set
• Screenshots of the blueprint App settings showing Knox Service Plugin install type

Still need help?

If you're still experiencing Knox Service Plugin KPE Premium license errors after reviewing this article, please submit a support ticket and include your device serial numbers, the specific error code (ERROR_INVALID_BINDING or ERROR_INVALID_LICENSE), and your Knox license details for investigation.