Based on the information from the Google documentation link you provided, the default uri for a datastream is immutable once it’s set up. This means it cannot be changed or updated after its creation, which can explain why you’ve been unsuccessful in updating the stream url. If you need to link your Datastream to a different URL, it might require setting up a new Datastream. Please consider the importance of setting the correct default uri at the beginning due to its unmodifiable attribute.