The SDK cannot list the above folders, what is the reason?
By default, API calls operate in the "member folder" of the connected account, not the "team space". You can configure API calls to operate in the "team space" instead though. To do so, you'll need to set the "Dropbox-Api-Path-Root" header. You can find information on this in the Team Files Guide. In the Java SDK, you can use the withPathRoot​ method to set that header.