Provision devices to Azure IoT Hub using a DPS symmetric key enrollment group with derived per-device keys
domain: iot · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
In your Device Provisioning Service instance, go to Manage enrollments > Add enrollment group and select Symmetric key as the attestation mechanism
Name the group, choose auto-generated or custom keys, link the target IoT hub(s) and allocation policy, then create the group — DPS generates a primary and secondary key for it
Assign each device a unique registration ID (e.g. derived from its MAC address or serial number)
Derive each device's own key by computing an HMAC-SHA256 hash of its registration ID using the enrollment group's primary key, e.g. via `az iot dps enrollment-group compute-device-key --key <group_primary_key> --registration-id <device_registration_id>`
Flash each device with only its ID Scope, registration ID, and derived key (never the group key) so it can attest with DPS and auto-provision to the linked IoT hub
Known gotchas
Never embed the enrollment group's primary/secondary key in device firmware — only ship the per-device derived key; a leaked group key compromises every device in the group
Deleting an enrollment group does not delete its device registration records, which still count against the DPS registration quota — delete the registration records first
Registration IDs and enrollment group names are case-insensitive, up to 128 chars, limited to alphanumerics plus `- . _ :`, and must end in an alphanumeric or dash
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