Using Groovy to Trigger a Data Management Batch

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how to trigger data management rule in PCMCS using Groovy in Planning — Cloud Customer Connect (oracle.com)

I've setup a connection called "DMJobs"

The connection details as follows using our service account for authentication, which has full admin rights to the planning instance:

I've written the following groovy script to run a batch job in DM

HttpResponse jsonResponse = operation.application.getConnection("DMJobs").post().

body(json(["jobType":"BATCH","JobName":"FCST_PUSH_CUSTOM"])).asString();

The groovy script runs without errors but appears to do nothing - the DM batch isn't executing as I'm not seeing any activity in the process log within DM.