Texto → Áudio (Amazon Polly)

Erro: Falha ao listar vozes: Error executing "DescribeVoices" on "https://polly.us-east-1.amazonaws.com/v1/voices?LanguageCode=pt-BR"; AWS HTTP error: Client error: `GET https://polly.us-east-1.amazonaws.com/v1/voices?LanguageCode=pt-BR` resulted in a `403 Forbidden` response: {"message":"The security token included in the request is invalid."} UnrecognizedClientException (client): The security token included in the request is invalid. - {"message":"The security token included in the request is invalid."}