I have created a SmartKey for my customer, but when he enters the SmartKey and I call WLRegSmartKeyCheck, the key is always invalid. For other customers, my generated keys work fine. Why?

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I have created a SmartKey for my customer, but when he enters the SmartKey and I call WLRegSmartKeyCheck, the key is always invalid. For other customers, my generated keys work fine. Why?

If some keys are working but not others, it might be because you have locked your license to a machine (hardware ID) and the user is not inserting the license in the specific PC (with different hardware ID)