Text-to-speech playback sample says it is unavailable in my browser. Seems to only be a problem on desktop client

Can reproduce CR on desktop canary and canary web (Chromium and Firefox). canary build 578 (30a0430), Electron 41.2.2, Linux 7.0.3-1-cachyos-bore-lto (x64), desktop canary 0.0.119, locale fr