Exit code 14 = "Not enough storage is available to complete this operation"
1.Please help check if the Dell device has enough disk space.
2.And also check if you have added the correct network drivers to you boot image. Please remember that the NIC driver you add to the boot image must match the version of WinPE and is independent from the OS you are deploying.
3.If there is any router/IP Helper, please help check there are configured correctly.
Similar thread for your reference:
PxeGetPxeData failed with 0x80004005
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