Create Report in Embedded Power BI with GenerateTokenRequestV2

I am also experiencing this issue.  I am generating embed token using pbiClient.Reports.GenerateTokenForCreateInGroup(targetWorkspaceId, tokenRequestParams);  In the client, I call powerbi.createReport(embedContainer, embedCreateConfiguration); where embedCreateConfiguration includes groupId of target workspace.  In the generated report object, I can see the groupId and datasetId represented in the createConfig attributes.  The standard SaveAs dialog will successfully save the report; however:

• It saves to the Dataset's workspace rather than the specified target workspace / groupId (set on the embedToken and in the embedCreateConfiguration) - this is the real issue for my purpose
• It still generates 401 error, but able to proceed: https://wabi-us-north-central-b-redirect.analysis.windows.net/metadata/customVisualsStore/organization/visuals 401

I updated the embedCreateConfiguration settings to include: useCustomSaveAsDialog: true

I added event handler for the saveAsTriggered event.  I then set targetWorkspaceId as part of the saveAsParameters similar to documentation here.  However, calling the saveAs function does not succeed in saving the report.  That is when I get 403 error similar to above:

https://wabi-us-north-central-b-redirect.analysis.windows.net/explore/explorations/?name=test

Using the error event handler I captured the error object:

• detailedMessage: "Unable to save the report"
• errorCode: undefined
• level: 2
• message: "ExplorationContainer_FailedToSaveReportDefaultDetails"

I would expect this to be effectively the same as the standard SaveAs dialog.  I can't find any information on the ExplorationContainer message.  The example SaveAs code is quite simple, so I'm wondering if this is a bug?

I am using:

• Microsoft.PowerBI.API (3.28.1)
• Microsoft.PowerBI.JavaScript (2.18.6)

The service principal has the required API permissions: Workspace.ReadWrite.All, Report.ReadWrite.All, Dataset.ReadWrite.All

And the fact that the standard dialog saves makes it seem like it is not a permission issue.

Any insight into how I can force the standard SaveAs dialog to use the target workspace or how I can get the custom dialog to work?