Need help with triggered schedule

My task:

When a window sensor reports ‘open’, a lamp
should be switched on after x minutes, for example.

I have

  • tried to create a schedule via a rule R1. This is not possible.

  • then I tried to define a schedule that is deactivated and not automatically deleted.
    Rule R1 should set the state of schedule to ‘enabled’ when the window is opened.
    I thought it would then wait x minutes and then execute the Akticon.

In fact, that doesn’t work either: When the trigger comes,
the schedule is activated, but the action is executed IMMEDIATELY
and not only after the defined period of time x

What am I doing wrong ?

How can I solve the task.

Many thanks for help

If you wish to enjoy the full automation potential from your ZigBee components, install Home Assistant and load the deConz integration in there. Then, making what you want - and much, much more becomes a piece of cake.