I have an iPhone 14 running iOS 26 Beta 2 that I wanted to start using Personal Voice on. It allowed me to complete the recordings and start the process, however even with the phone charging and locked the process hangs.
It is connected to WiFi and cellular while attempting to run. It is connected to a 20W apple charger with an offical cable. I have a sneaking feeling it's related to me running the iOS beta on this device. I've provided some info below.
iOS 26 Beta 2 iPhone 14 128gb Model MPUF3ZD/A No SIM restrictions