Coros running power displayed in graph not in intervals

My Coros Pace 4 estimates running power. I can see the power in the Activity Timeline. But when I have intervals for a sessions, the cells for power remain empty. Why is that?

Probably because you did not setup the Power threshold and zones yet.

That was indeed the case; I wanted to use the averages to set my initial FTP. Now I do get power in the tables.