Hey,
The “Display Name” is only the name of the cloud connection to identify it again. In S3 there it is not possible to use an email and URL combination or something like that. That’s why the user need to specify a name which identifies this cloud connection but it is only stored in the local database and not used for something else. That means your “Display Name” isn’t related to this problem.
Currently we still need the “Allow List All Bucket Names” scope, maybe this isn’t granted to this credentials? We’ll remove this scope soon. If this isn’t the problem too, please enable debug mode, reproduce the authentication and send us after that the log file: How do I enable debug mode on Android?