Flight Tracking No Longer Working on App

I’ve been using FlightAware for many years, and used to love the flight tracking alerts (I get a text when flight has departed, arrived, delayed, etc.) For some reason the Flight Alert feature no longer works when I use the mobile app - I consistently get the “Retrieval Failed FlightAware could not track the flight you requested” popup every time I try to add a new alert. This happens for multiple kinds of flights, most domestic, some international.

I am running the app on a Galaxy 9 Plus, Android 9.0, FlightAware version 5.5.3. Any assistance would be appreciated. Thanks!