亚马逊S3访问被拒绝 - Java SpringBoot

我需要在aws上设置我的图像，我已经把我的bucket配置为公共的，但我只是得到了 "AccessDenied"

public boolean saveImage(String nome, String base64){
        try {
            byte[] imageBytes = Base64.getDecoder().decode(base64.split(",")[1]);
            BufferedImage image = ImageIO.read(new ByteArrayInputStream(imageBytes));
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            ImageIO.write(image, "png", baos);
            byte[] bytes = baos.toByteArray();
            String fileName = nome+".png";
            BasicAWSCredentials awsCreds = new BasicAWSCredentials(acessKey, secretKey);
            PutObjectRequest putObjectRequest = new PutObjectRequest(bucketName, fileName, new ByteArrayInputStream(bytes), new ObjectMetadata());
            AmazonS3 s3Client =
                    AmazonS3ClientBuilder.standard().withRegion("sa-east-1")
                            .withCredentials(new
                                    AWSStaticCredentialsProvider(awsCreds))
                            .build();
            s3Client.putObject(putObjectRequest);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;