ALLNET 3419 plugin doesn't monitor sensors

CMK version: 2.0.0p23 (CRE)
OS version: Debian 11

Error message: I have installed and activated the SNMP module on the ALLNET 3419 IP-sensor, however check_mk provides me only basic data (uplink, RAM, uptime), but no sensor data. Do I need to import the MIB file somehow for this, or what am I doing wrong?

Output of “cmk --debug -vvn hostname”: Hastebin: Send and Save Text or Code Snippets for Free | Toptal®

The ALLNET IP sensors are not monitored with SNMP. There you find a special agent under “Other intergrations” → “Hardware”.
It uses the XML interface of these sensors.