API POST Request Fails: APNX-1-4552-028

Question

I'm attempting to use the Import endpoint of the Appian Deployment REST API v2. However, it continues to return the error listed below. I suspect that the error might be with the permissions with the service account associated with the API Key but cannot be certain. Is there any way to get more information on this error? 
 {"resource":"\/suite\/deployment-management\/v2\/deployments","title":"An Error Has Occurred","error":"APNX-1-4552-028","message":"Project is not accepting export requests via this endpoint. Contact your system administrator to configure this feature."}

s23 · Accepted Answer

I never found a complete solution to this, but it looks like using v1 (i.e. https://${{ secrets.APPIAN_DOMAIN }}/suite/deployment-management/v1/deployments) of the API resolves this error. It's unclear why v2 does not work. 
 The API v2 was not introduced until 23.3. The current version of my Appian Cloud is 23.2. A point that should be made very clear in the documentation.

Peter Lewis · Answer

Have you enabled external deployments in the Admin Console? That sounds like the likely culprit here: docs.appian.com/.../Appian_Administration_Console.html

API POST Request Fails: APNX-1-4552-028

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