@lemonicedtea: Knox Mobile Enrollment is a zero-touch deployment service that allows users to quickly enroll large number of Android devices to an MDM/ EMM for corporate use. Even if a KME-enrolled device is factory reset, the MDM/EMM software will be automatically reinstalled and the user will be re-enrolled. With this in mind, I recommend contacting the seller directly to discuss obtaining the necessary credentials, or to arrange a refund or replacement. Apologies for any inconvenience this may cause you.
@lemonicedtea: If you're able to confirm the credentials then you will be able to gain access to the device, however as this is an embedded security feature it may not be possible to remove to remove it completely. I understand that it isn't ideal, however it was the sellers responsibility to have this feature removed by their IT department prior to selling it.
@lemonicedtea: You can try visiting a Support Centre near you, taking your proof of purchase with you, to see if an engineer can assist you further, however this may not be possible due to it being a security feature, and because the device was purchased on Ebay.
