Hi team,

{
"error_code": "INVALID_PARAMETER_VALUE",
"message": "Retrieving the output of runs with multiple tasks is not supported..."
}
means the job you're triggering (job_id = 'my_job_id') is a multi-task job (even if it has only one task). In such cases, jobs/runs/get-output only works on task-level run IDs, not the top-level job run ID.

Solution:
1. To get the output from a specific task within the job: Get the run_id from the jobs/run-now response.
2. Call /api/2.1/jobs/runs/get with that run_id.