Viorel is correct with regard to scenario not being supported. However, technically it should still work. In your bat-file you have to provide the full path to Access and then path\file of your accdb.
Example:
"C:\Program Files (x86)\Microsoft Office\root\Office16\MSAccess.exe" "C:\Access\SCM_update.accdb" /cmd Nightly
(all in one line, separated by spaces)