The new version is live and accepts runs.

The external ID is not a valid external ID, or publish was refused and the error says why.

The x-api-key or x-organization-id header is missing.

No workflow in your organization has this external ID.

Another publish of this workflow ran at the same time.

The draft failed one or more checks, and validation.errors lists each one. Also the answer to a body that is not valid JSON.

Something failed on our side.

Popp could not finish a check, for example because your ATS was unreachable. Send the same request again after the Retry-After delay.