I think the reason for the unknown error is that this isn’t a valid json document (it can be made one by enclosing everything in {}). I tried doing that and then got an “Invalid JSON” error for the extra commas. When I removed those, I got an internal error for not having configured datacenter IDs on my cluster. It sounds like we have some work to do to polish this command and more clearly document it, but maybe you can try doing the above and seeing how it goes? I’ll also try configuring my cluster with datacenters and see if I can make more progress.