2x TuYa TS0001_switch_module and 1x TS0002_switch_module switching as group?

Hi,

this is my first step deeper into HA. Up to now I have only sensors and TRVs, without any automations. Bear with me.

I have 3 independent lights with their switches in my hallway. I want all of the lights to be switched with all available switches. To solve this, I have mounted two TuYa TS0001_switch_module and one TuYa TS0002_switch_module, where the l1 endpoint is used for one light. All of them are set to toggle mode.

I now can switch all the lights independed as before, and have the possibility to switch them over zigbee2mqtt exposed state.

Now I tried to create a zigbee group and add the swich modules (and the endpoint l1).
devices.yaml:

'0xa4c138b5d21d492d':
  friendly_name: switch_module.uf_hallway_light
'0xa4c13857541e99e6':
  friendly_name: switch_module.gf_hallway_light_kitchen-door
'0xa4c13852c4de7fca':
  friendly_name: switch_module.gf_kitchen_light

groups.yaml:

'11':
  friendly_name: switch_module_group_hallway
  devices:
    - 'switch_module.uf_hallway_light'
    - 'switch_module.gf_hallway_light_balcony-door'
    - 'switch_module.gf_hallway_light_kitchen-door/l1'

I restarted Z2M, but this didn’t change anything. At least I didn’t observe any change.
Did I misunderstand ZigBee groups?

What I did, but didn’t bring my to a working solutions had been to convert the switches to lights and group them. Now I can switch them in Lovelace, but when I use the hardware light switches it also only switches the connected light. Which is expected I guess…

I also read something about ZigBee binding. Is this what I need?

Or do I need to set up automations for every switch to switch the other two?

Thanks for your help!

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