It's possible that you have entered a bucket name that violated S3's bucket naming rules .
Additionally, "TypeError: Network error when attempting to fetch resource" usually indicates CORS error . This might happens if you're sending your create bucket request to a region other than us-east-1, since your application will have to handle 307 Temporary Redirect , thus triggering a CORS error. The sample code from the tutorial allows you to change the configured region by changing the line (line 18) const REGION = "REGION" to const REGION = "us-east-1", which might resolve the CORS error.
DynamoDB Data Mapper, SDK v3Accepted Answerasked 20 days ago