I’m testing a TestFlight app and I got a restore purchases prompt which I entered my iTunes password into. After I found a new “sandbox account” section in the iTunes & App Store settings which showed me signed into my normal iTunes Apple ID. So I was signed into iTunes and “Sandbox” with the same Apple ID. Considering the help text says that the Sandbox account isn’t used for TestFlight apps, I have no idea how I even got signed in. I signed out of the Sandbox account, but now the setting appears stuck there. Is there some way to get rid of it?