See our return/repair policy at the following link:
Before shipping defective devices you must deprovision the license.
Do the following to deprovision the devices:
- Sign in to the Admin console at https://admin.google.com.
- Go to Chrome devices > Devices.
- In the device list, select the provisioned or pending device(s).
- Click More Actions and choose Deprovision.
- In the warning message that appears, click Deprovision to complete the process.
More information on deprovisioning devices can be found at https://support.google.com/chrome/a/answer/3523633?hl=en