Nuki Opener does not open the door with TC30

Hi all,
I am using a Nuki Opener (firmware 1.11.0) with a Koch TC30 and a Google smartphone (Android 15).
The TC30 works perfectly after the installation (intercom, door opener), but the Nuki does not open the door, neither through the app nor via the button.
I already tried the simple installation (only black and red cable) and the proposed installation (5 cables).
Any suggestions?

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