UWP C++ S3 PutObject (upload file) error: Unable to parse ExceptionName: BadRequest Message: An error occurred when parsing the HTTP request.

Im trying to attach a function to upload a file directly to my bucket in s3 on my UWP's Application, bug im getting this errrorrrrrrrrrrr: Unable to parse ExceptionName: BadRequest Message: An error occurred when parsing the HTTP request.

Here's my S3 upload function code:
{
Aws::Client::ClientConfiguration config;
config.region = Aws::Region::SA_EAST_1;

Aws::S3::S3Client s3_client(credentials, config);  

Aws::S3::Model::PutObjectRequest request;  
request.SetBucket(bucketName);  
request.SetKey(objectKey);  

std::shared_ptr<Aws::IOStream> input_data =  
	Aws::MakeShared<Aws::FStream>("SampleAllocationTag",  
		objectName.c_str(),  
		std::ios_base::in | std::ios_base::binary);  

request.SetBody(input_data);  

Aws::S3::Model::PutObjectOutcome outcome =  
	s3_client.PutObject(request);  

if (outcome.IsSuccess()) return true;  
  
else  
{  
	std::string sToConvert = outcome.GetError().GetMessage();  
	std::wstring w_str = std::wstring(sToConvert.begin(), sToConvert.end());  
	const wchar_t* w_chars = w_str.c_str();  
	Windows::UI::Popups::MessageDialog msg(ref new Platform::String(w_chars));  
	msg.Title = "Database Error";  
	msg.ShowAsync();  
	return false;  
}  

}

how can i fix this? :(