The customization S3 bucket associated with your application identifier holds the customization.zip, the application needs for the custom styles, images, fonts etc
To be able to access the customizations, you need to make sure that Kudo has at least read access to it.
To allow s3 bucket access to Kudo, put a bucket policy on the partner s3 bucket allowing the desired actions to Kudo account : 649336859113
{ "Version": "2012-10-17", "Statement": [ { "Sid": "PermissionsforKudoAccount", "Effect": "Allow", "Principal": { "AWS": [ "arn:aws:iam::649336859113:root" ] }, "Action": [ "s3:GetObject" ], "Resource": [ "arn:aws:s3:::kudo-demo-customizations", "arn:aws:s3:::kudo-demo-customizations/*" ] } ] }