SSIS fails when attempting to execute AZcopy via execute task using SQL Agent Job - error "The process exit code was "8" while the expected was "0""

The Package runs perfectly when run on the remote desktop. 

Only fails when run via the SQL Agent Job, and returns the error - The process exit code was "8" while the expected was "0"

Does Exit code "8" refer to anything in particular? (Or is this a generic message.)

Any advice would be appreciated.