This is with version 1.0.0 (72) of Radio Messenger from the App Store. My device, an iPhone 17 pro max, was enrolled for the TestFlight builds before the App Store release. My subscription is active.
Minor annoyance, but the toggle for call sign lookup keeps sliding back to disabled. It seems to happen most reliably upon launching the app, although I think I’ve seen it at least once when switching back to the already running app.
Let me know if I can provide any debugging information.