Creating an app that will use TTS after a call has started

I am trying to create an emergency app on Mit App Inventor. Part of the app is when the user clicks a button, it will call 502-486-9764. After the call is connected, I want it to say a message I typed in the code tts.

. For some reason, the tts keeps talking really quiet and the person on the other line cannot here it Does anyone know why this is happeneing?

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