I have the same behavior with my 2026 GMC Acadia AT4.  I've found that while on the vehicle 5G connection the Pandora app always displays "Waiting for connection" however other apps such as YouTube Music do work.  And if I connect the vehicle infotainment system to my home Wi-Fi network then the Pandora app does load and play music.  I've also tried force stopping the Pandora app and clearing the cache and data as well as uninstalling and reinstalling it.  The currently installed app version is 2607.3.  Thank you. ... View more