HTML exports have limitations with audio due to using a different API
Double check your players with these points in mind: https://docs.godotengine.org/en/stable/tutorials/export/exporting_for_web.html#audio-playback
Godot Engine documentation
HTML5 export allows publishing games made in Godot Engine to the browser. This requires support for WebAssembly and WebGL 2.0 in the user's browser. Export file name: We suggest users to export the...