`viktor.max.stable` fails to update because of absence of the Api-Key

Start by reproducing the reported device initialization failure and inspect the request-serial step, focusing on how the Api-Key is supplied. Confirm the cause of the 400 response, then verify that updating viktor.max.stable completes successfully without the Request device serial error.

Hostname: srly-pdayp7xf1nmqcmz

/tmp $ cat changes.yaml | yq 'select(di == 0) | [.result[] | select(.status = "Error")][0]' | head -n 2000
err: 'cannot perform the following tasks:

  - Request device serial (cannot retrieve request-id for making a request for a serial: unexpected status 400)'
id: '1683'
kind: become-operational
ready: true
ready-time: '2025-06-23T03:21:51.217303287+01:00'
spawn-time: '2025-06-23T03:21:50.511320347+01:00'
status: Error
summary: Initialize device
tasks:
  - data:
      affected-snaps:
        - screenly-gadget-amd64
    id: '49903'
    kind: run-hook
    progress:
      done: 1
      label: ''
      total: 1
    ready-time: '2025-06-23T03:21:51.21730088+01:00'
    spawn-time: '2025-06-23T03:21:50.511310826+01:00'
    status: Undone
    summary: Run prepare-device hook
  - id: '49904'
    kind: generate-device-key
    progress:
      done: 1
      label: ''
      total: 1
    ready-time: '2025-06-23T03:21:51.20712304+01:00'
    spawn-time: '2025-06-23T03:21:50.511318189+01:00'
    status: Done
    summary: Generate device key
  - id: '49905'
    kind: request-serial
    log:
      - '2025-06-23T03:21:51+01:00 ERROR cannot retrieve request-id for making a request for a serial: unexpected status 400'
    progress:
      done: 1
      label: ''
      total: 1
    ready-time: '2025-06-23T03:21:51.199175122+01:00'
    spawn-time: '2025-06-23T03:21:50.511318998+01:00'
    status: Error
    summary: Request device serial
/tmp $ cat changes.yaml | yq 'select(di == 0) | [.result[] | select(.status = "Error")][0]' | head -n 2000

This device is broken and should be investigated.