Sometimes “Welcome to the task sequence wizard” will give task sequence failed with error code 0x80070057 msg before even start checking the computer policies.
Reviewing SMSTS.log (Under X:\windows\Temp\SMSTSLog\) will show;
MP Location returned an empty site code
RequestMPLocation failed; 0x80004005
GetMPLocation failed; 0x80004005
Failed to query for MP location
Typically the error msg indicates an issue with the site hierarchy configuration (site assignments and boundaries) and the client machines cannot reach the SCCM management point.
Make sure a valid site code is assigned and correct boundary is created.