Cannot resolve an incident of type failedExternalTask

Ended up posting a different question and got a response which answer my question:

So ended up needing to get back the transition id using:

{{host}}/rest/process-instance/{{processid}}/activity-instances

look for the the childTransitionInstances id

Then using that you can use:

{{host}}/rest/process-instance/{{processid}}/modification

with payload:

"skipCustomListeners": true,
"skipIoMappings": true,
"instructions": [
    {
      "type": "cancel",
      "transitionInstanceId": "{{transitionid}}"
    }
  ]
}

That essentially cancels the incident

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