Thanks for sharing your question Inez. It’s common that the development/engineering manager role changes when Scrum is introduced. But the individuals playing the role still act as the line managers of (some of) the developers in my experience. I therefore recommend viewing them as stakeholders and managing them accordingly (they are subjects according to the Power-Interest Grid). Invite them to sprint review meeting at least once per quarter as a rule of thumb. This keeps them engaged, and it allows them to see the work of their staff and offer feedback and advice. Hope this helps!