In order to redirect a report wich was deployed into Power BI Online from QA to PROD environment, Is it really necessary to do that modification in a new PIB desktop file? Isn't it possible to do that from the service itself?
As far as I know, there is no any option on the service to change data source for reports currently. I would suggest you submit this as an idea on Power BI Idea to improve Power BI on this feature.
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