Open Building Designer could not find the workset override file.
Please add "__iModelHubPublishSettings__.txt" file in the same folder where the input dgn file is present.
The following line should be added in the "__iModelHubPublishSettings__.txt" file
WorkSetOverride=<specify the name of the workspace in case of workspace associated with dgn is not found>
e.g. WorkSetOverride=BuildingTemplate_US