What authorizations for Information Broadcasting are required?

Hello experts, this is a scenario which has recently arisen. We have the BEx Broadcaster properly configured for e-mail broadcasting at least. Users need to be able to use the Broadcaster, in particular the e-mail function for WAD reports. However, we do not know what roles/profiles/transactions must be assigned to them. Whenever users call the broadcaster, the broadcaster wizard popup window opens but displays nothing (sends a "page not found" error). We know it is properly configured since we tested it with a user with profile SAP_ALL and it worked correctly. Since no one has that profile assigned (because of obvious reasons), the Broadcaster cannot be used.

Any suggestions?