Connect a/b Patchbox Pro gong to the door intercom system

Hi,
I have an intercom system with an a/b Patchbox Pro from L-Tek.
It works fine so far.
In addition to the ringing phones, I (or rather the government) want a traditional chime. The chime is a Grothe Croma 100A.
I have studied both manuals, but I can't find a common denominator.

Can you tell me how to connect the two together?

So far, I have considered connection diagram "C" to be sensible.
But when I connect it that way, nothing happens at the chime when I press the doorbell button.
Not even an LED lights up.
Actually, only C and D make sense to me for now. Because the Patchbox only provides 2 wires to the chime (12V, right?)
Or do I have to supply the chime with continuous power (12V or 230V)?

You connect the doorbell here. It has nothing to do with C; that is only the power supply for the entire system and the doorbell buttons.

Yes, I connected it there as well. with 2 wires. And created the bridge as shown. But where do I connect the two wires coming from the patch box on the gong? By "C" I mean connection diagram "C", not terminal designation "C". Maybe I should have mentioned that... The right part of the picture shows the connection diagrams of the gong. On the left the connection diagram of the patch box.

You connect the two greens from the patchbox according to the circuit diagram to B =/~ and C1.

OK, but I don't want to use batteries. I thought that the Patchbox supplies the 12V power supply at the moment the bell needs it and simultaneously triggers it. If the bell needs constant voltage, I can just run 12V from the doorbell transformer!?

Just leave out the batteries and then connect it to D.