Procured Office 2019 Standard keys from VLSC. Downloaded ODT and installed it. Used the sample config.xml to make an Office 2019 Standard specific configuration-Office2019Standard.xml. Use ODT's setup.exe to download Office 2019 Standard to a local network location based on the contents of configuration-Office2019Standard.xml. Finally start Powershell as admin, cd'ed to UNC network location mentioned above, and run .\setup /configure .\configuration-Office2019Standard.xml. This returns nearly immediately with the error code listed in the subject above.
TIA,
Tim