Schedule meetings, move tickets around, moderate meetings, call more meetings, scold misbehaviour during meetings, help management with their stuff(secretary/personal assistant?), scold other teams for not helping out in time, question about stale tasks(tickets), act as coordinator of news/requests/demands from other teams, attend all meetings which involve tickets, coerce/seduce other teams to deliver something early because our team has messed up, promote more scrum agile topics. At least that is what I observed at my work. They indeed do a lot of work but often not well defined.