Endpoint on output tool was incorrect as generated by ALTERYX . Default END points worked for Amazon s3 download and amazon S3 upload but writing into table ( output tool) failed with this error .
The bucket you are attempting to access must be addressed using the specified endpoint. Please send all future requests to this endpoint.
Our default is us-west-2 . Alteryx tool generates us-east-1 and hence the error
Solution : Keep default everywhere but override in output tool
This is valid only if settings by Amzon S3 folks in your company is done right ( Default Region set up , Bucket Assigned to this . Encryption enabled AE 256)