Text to Speech does not work anymore

I created a small app almost a year ago with a text to speech feature. It worked perfectly.
Yesterday I updated the blocks for a new feature and now the text to speech does not work on some android versions.

Did something change? Can I change something to make the text to speech work again on all androids?

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show your blocks please…

it works on some smartphones but not the ones anymore that I previously used for this app.

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