The panel enclosure need to be bonded to the grounding system; this makes sure any fault to the metal case journeys a breaker

https://juliusjkzg080.terracolumn.com/posts/electrical-panel-101-security-capacity-and-code-compliance

The panel enclosure should be bonded to the grounding system; this ensures any fault to the metal case journeys a breaker instead of energizing exposed surface areas precariously.