No "scan sync code" button on my androids

On the Android device you’re looking to add, go to Settings --> Sync then select I have a Sync code. Click Scan or Add Sync code. Then, on one of your other devices already on the chain:

  • For a Desktop device, go to Settings --> Sync --> Manage your synced devices, then click Add new device to view your scan options:
    image
  • For an Android devices, go to Settings --> Sync -->, then select Add new device to view the scan options.