Same problem here on my iPhone 14 Pro running iOS 16.4.1. App built with Xcode 14.1. Does speech synthesis no longer work?
Error:
2023-04-13 20:54:46.115465-0400 Boswell[18755:3961616] [AXTTSCommon] MauiVocalizer: 16038 (Resource load failed): component=ttt/re, uri=, contentType=application/x-vocalizer-rettt+text, lhError=88602000