Hi @Ton60,
What TTS (Text to Speech) engine/module do you have in Android Settings/General Setting/Text to Speech (Instelligen/Algemeen beheer/Tekst naar spraak)?
The Samsung TTS Engine is quite limited in supported languages (no Dutch as far I know, thus possibly English is set as default resulting in Dutch with English pronunciation).
Try the Google TTS Engine, it should support Dutch…
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