States working but state_attr not

Hi all,

I want to get a state attribute based on a variable (for example hard coded) with the entity_id.

              {{ state_attr('switch.shellyplug_1', 'last_changed') }}
              {{ states.switch.shellyplug_1.last_changed }}

The states function return the value, but state_attr not. I’m I doing something wrong?

UPDATE:

Okay I’ve read last_changed is a property and not an attribute. What is the difference between states and state_attr - #6 by tom_l

How can I use a variable in this line then?

{{ states.switch.shellyplug_1.last_changed }}

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