Trying to set up Google Speech Kit Plugin

Development Programming & Scripting Blueprint
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Hi there, I just bought this plugin from the marketplace Google Speech Kit in Code Plugins - UE Marketplace and I’m following the documentation to set it up. (GitHub - IlgarLunin/UE4GoogleSpeechKit-docs: Documentation page for GoogleSpeechKit ue4 plugin).

My blueprint is all set up as documentation say (see image below) but when it arrives to “Google STT” node nothing happen.

I don’t even know if my API key is working.

Any help?
thank in advance

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Here is my blueprint setup:

immagine
immagine1178×733 135 KB

It should be the same of the documentation (except for the “play sound” left there).

Is there anything I’m missing in calling API key or in Google TTS?