You appear to be successfully authenticating to Viya using an authorization code, so your REST API request to run the job is successful. This triggers a request from job-execution to compute to run the code. To do so, compute attempts to start a compute server through a request to the launcher service, which would submit the attempt to the launcher server. The "Access Denied" error is coming from the launcher server when authenticating against the host. If you store a valid user ID and password to launch the process on the compute server host for your identity under Environment Manager > My Credentials in the DefaultAuth domain, is the launch successful?
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