If you have used switching time for opening and closing in the first step, e.g. 7:00 and 20:00, all switching times for the group are assigned with it. You cannot therefore add any further Astro time. For Astro, blocked is displayed.
You must first set one of the two switching times to OFF in order to be able to use the appropriate Astro function again. For example, select time 2 and press the OK key. Then press the arrow to the side until OFF is displayed. Then select Astro from the menu. The blocking is removed and you can activate the Astro time.