Not that it's going to fix the specific issue you are currently troubleshooting here, but I just pushed a small update to both versions (latest and experimental) to automatically follow redirects when connecting to streaming endpoints.
Life has been too busy to even think about ADBTuner, but it seems LinkPi has taken over as the default encoder so I figured I could squeeze in a one line fix lol. This should let the URL displayed in the LinkPi user interface work directly without having to replace it with the actual target.