In that case I would suggest you log on to the server and attempt to run the sas_u8 command line, with all of the parameters as shown in the SAS Object Spawner log, as a user that it fails for, to see if you get any additional details are provided to explain the failure (make sure you omit any -noterminal parameter for an interactive test).
If that doesn't highlight the issue then I'd suggest the next course of action would be to contact SAS Technical Support.
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