Hi,
Client session report proivde the complete association history of clients (to which AP/usage/connection mode/type etc) for the time period report is been scheulded.
Go to client >detail page in Airwave for more detials to see if it have username associated,if controller reporting username then airwave will upate that info in its database.
Airwave retain the client data dependend on historical retention setting configured in AMP Setup>General>Historical Retention setting.
If controller shows username when user is active but it is not updating in ariwave then need to enable debug logs in Airwave and need to see whether contorller sending name or not?
Regards,
Pavan