Can't access S3 Pre-Signed URL due to authorization [duplicate]

Answer 1

Using some help I've found the answer, which was a combination of 2 missing pieces (one of which was referred to in the comments):

1. Need to set this:

   System.setProperty(SDKGlobalConfiguration.ENABLE_S3_SIGV4_SYSTEM_PROPERTY, "true");
   

2. Must set the "endPoint" (which was not required for upload or download):

   s3Client.setEndpoint(endpoint);
   

Optionally it might be useful to also add this:

s3Client.setS3ClientOptions(new S3ClientOptions().withPathStyleAccess(true));