Hi Bruno,
Welcome to the Atlassian Community! I hope it's okay if I respond in English 🙂
To use the Trello app in Google Chat, a work or school account is required. Could you please check if that's the case?
If you do have a work or school account, please try following the steps in this article: https://support.atlassian.com/trello/docs/trello-for-google-hangouts-chat/
Hope this helps!
Alina | The Trello Team
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