Xenon as standalone unit

What device OS version have you got on that device?

Have you had that device ever joined to a mesh?
It should not be required, but you could try flashing this code, run it once and then flash your own code again

#include "Particle.h"
#include "dct.h"

SYSTEM_MODE(SEMI_AUTOMATIC);

void setup() {
    const uint8_t val = 0x01;
    dct_write_app_data(&val, DCT_SETUP_DONE_OFFSET, 1);
    pinMode(D7, OUTPUT);
    digitalWrite(D7, HIGH);
}
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