You are using Windows Authentication and have updated the primary hub Nimsoft Watcher Service "Log On As" properties from one user to another and after this you can't see the published or any other OC Dashboards in the Dashboard webapp.
When logged with the new New user to the DX UIM Backend DB, the umpDashboard table shows empty while when logged with the original user the table shows correct entries, but still in the OC there is no existing dashboard as before this change.
DX UIM 23.4.*
When Windows Authentication is used, and the user is updated in both Nimsoft Watcher Service and data_engine the default schema of the new created user on the DB might not be defauling to [dbo]. In this scenario new umpDahboards tables were created with the a different schema, causing this tale duplication and causing the OC to refer to the new schema rather than the default that should be [dbo].