When teams start adopting agile practices, managers often feel lost or out of place. Their role has changed, and it is not clear what they should be doing. They are told not to talk at daily scrums, don't assign tasks to team members, and don't tell the team how to do the work. Where does that leave managers? They have to grown, and they are responsible for creating an environment that fosters growth for teams and individuals.
It leaves them with an incredibly difficult job--normalizing discomfort:
There is a great checklist on Dr. Brene Brown's website for giving engaged feedback.