A 400 response usually indicates invalid or missing required parameters, but can trigger for many reasons. This sample 400 error represents an attempt to activate an EdgeWorker that's already active:
{
"detail": "This version is already being activated on staging",
"instance": "/edgeworkers/error-instances/8b95c971-f6b3-4479-a393-202be75e43e1",
"status": 400,
"title": "Bad Request.",
"type": "/edgeworkers/error-types/edgeworkers-bad-request",
"errorCode": "EW1021"
}