Confirming the obvious: so you do not see a Join Accept for that device in TTN Console? Any chance the Join Request for that device has been received by multiple gateways? Click the Join Request in TTN Console to see more details, and maybe even an error.
Are you sure you’ve got MSB or LSB right? See Hex, lsb or msb?
As an aside: it’s not the gateway that is accepting anything; it’s the network, hence TTN, which processes the Join Accept. Also, the AppEUI is not a secret; anyone can decode that from the radio transmission, or the payload you posted above.