I can’t find anything specific on the Crossref domain that explains this error, but I get the impression that this error is just letting us know that this DOI was resubmitted. Can you provide some insight into what the duplicate key was? I assume that we are submitting XML multiple times and this error is letting us know that.
Thanks for flagging that error to us. We thought we fixed this last month. I have simply rerun submission 1661159289 and that cleared things up. I have flagged this error back to our technical team so they can investigate the underlying cause. If you see this error again, please do let me know.
Sorry for my slow response on this. Yes, you can simply resubmit these errors when you see them. We think this is related to the fact that we’re processing submissions more quickly on our new database setup. As a result, that may be why we’re seeing more examples of this error. Yes, please do flag additional examples to us @mklem .