Why does my team agree in meetings and then nothing changes?
Because agreement is not ownership. A meeting can produce nods without producing a decision, an owner, a deadline, or a consequence. The room left agreeing. Nothing left assigned.
The meeting happened. The decision did not.
The deeper issue
Agreement is a social signal. Ownership is an operational signal. They are different layers. Most rooms generate the first and assume the second will follow on its own. It rarely does.