HM-sen-wa-od Sensor not appearing in HA

[albanetwork]

Hello,

I tried to integrate my "new" Hm-se-wa-od Sensor into HA but no luck so far.
The Sensor is perfectly available in Homematic (CCU3).

As there is no Sysvar for this device in my ccu, I can't access the value via sysvar.
There is also not even a sensor entity visible under my entities in HA (so no device and no entity available).
How do I integrate this sensor into my homematic ip local integration then?
So I tried the following:

template:
  sensor:
    #Zisternen Sensor
      - name: Sensor Zisterne
        unique_id: "SensorZisterneFuellstand"
        icon: mdi:water-sync
        unit_of_measurement: "L"
        state: >-
            {% set h = states('sensor.sensor_zisterne') | float / 100 * 1 %}
            {% if h >= 0 and h <= 1 %}
              {% set r = 2.4 %}
              {% set term1 = r**2 * acos(1 - h/r) %}
              {% set term2 = (r - h) * sqrt(2*r*h - h**2) %}
              {% set result = (2.4 * 1000 * (term1 - term2)) | round(0) %}
              {{ result }}
            {% else %}
              {{ None }}
            {% endif %}

This isn't working either. What am I missing?

Edit: Nevermind, I had to reconfigure my Integration, though bidcos-rf was checked to begin with. I don't know what happened.