cannot upload Autopilot after changed mainboard

The 808 - ZtdDeviceAssignedToOtherTenant error means the hardware hash of the new motherboard is already registered to a different tenant. That record must be removed before the device can be imported into the current tenant.

Follow these steps:

1. Confirm the device record in Intune
   1. Sign in to the Microsoft Intune admin center.
   2. Go to Devices → Windows.
   3. Under Device onboarding, select Enrollment.
   4. Under Windows Autopilot, select Devices.
   5. Search by serial number or hardware hash. If the device appears in the list for the current tenant, select it and choose Delete. Wait a few minutes for deletion to complete, then try importing the CSV again.
2. If the device is not in the current tenant If the device record does not exist in the current tenant (because it is registered in another tenant), Microsoft Support must remove it from the Autopilot service:
   1. Collect the following:
      • The CSV file that fails with error 808.
      • Proof of ownership (original invoice or bill of sale in PDF, showing the device serial/chassis ID and the company name).
      • Diagnostic logs from the device (if accessible) using:

                Mdmdiagnosticstool.exe -area Autopilot -cab c:\out.cab
        

   2. Create a service request as described in How to get support in the Microsoft Intune admin center and attach the CSV, proof of ownership, and logs.
   3. Microsoft Support will verify ownership and remove the old Autopilot record from the other tenant so the device can be registered to the current tenant.

For motherboard replacement scenarios, if Autopilot profile status shows Fix pending or Attention required after the hardware change, deregister and then reregister the device as part of the repair workflow.

References:

• Error 806 or 808 when you import Windows Autopilot device CSV files in Intune
• Manually register devices with Windows Autopilot
• Windows Autopilot motherboard replacement scenario guidance
• Windows Autopilot troubleshooting FAQ
• Windows Autopilot for HoloLens 2
• Windows Autopilot: What's new