Change Paginated Report Dataset programatically

bradsy v-hashadapu 

Sorry on my latency.

Keeping the same datasourceName didnt help. I get now the following error:
| One or more errors occurred. ({ "code": "InvalidRequest", "message": "Rdl UpdateDatasources updateDetails should not contain duplicated datasource Id's" })
 Invoke-PowerBIRestMethod -Url $endpoint -Method POST -Body $body
| Encountered errors when invoking the command: { "code": "InvalidRequest", "message": "Rdl UpdateDatasources updateDetails should not contain duplicated datasource
| Id's" }

Mind you that if I put the same datasourceName how does it knows how to switch ? 

To mention that the paginated report sits in a workspace(call it workspace1)  and is connected to a dataset from another workspace (call it workspace2). What I want is to reconnect the paginated report to a dataset from another workspace( call it workspace3). 

The service Principal is the admin of the workspaces.