If a user tries to order machine captions for a file which has already had machine captions generated they will see an error: "Service was already requested for this video."
This affects anyone who has already requested machine captions for a video but who tries to re-request machine captions for the same video.
This issue is present as of 2/5/20. Learn@UW-Madison has requested Kaltura consider adding a feature to re-request machine captions if needed.
Currently the only workaround is to re-upload your media file as a duplicate entry in Kaltura MediaSpace and then request machine captions on that file.