Matter validates Device Attestation Certificates at setup. DAC invalid on Apple or Google hubs blocks commissioning — seen with counterfeits, corrupted flashes, or rare firmware bugs.
What to check
Purchase channel — authorized retailers only. Firmware current via OEM app if BLE still works. Same error on two hubs points to device; error on one hub only may be controller strictness.
Steps
Factory reset once. Retry single-fabric commission. Document error screenshots for RMA if new-in-box fails twice. Do not use unsigned hub hacks to bypass DAC — security risk.
Home Assistant test modes differ from consumer hubs; do not expect Apple to ignore invalid DAC.
Verify
Retail unit commissions without attestation error on primary hub.