The issue has been identified. With this being a Friday ahead of a holiday for many members of our team, we will not be deploying a fix until Tuesday, 29 August at 1400 UTC.
Posted Aug 25, 2023 - 15:53 UTC
Investigating
Members and users accessing OAI-PMH, including members using the Deposit Harvester and OAI-PMH to retrieve Cited-by matches, may be receiving 401 unauthorized status code errors. We believe this is related to the special maintenance performed earlier this week. We're investigating.