Synology SNMP monitoring does not work

[Quintessenz IT]

Hey,
I will monitor a Synology DS918+ (DSM 6.2.2-24922 Update 4) with Zabbix 5.0.3.
My tests with different Synology templates (e.g. zbx_export_templates.xml / Synology SNMP Monitoring Zabbix 4.0.x) gave me the same error.
Cannot find host interface on "hostname" for item key "syno.System.cpuFanStatus". If I delete the item (for test) I get a different item key.
On the Synology is SNMP v1/v2 enabled and v3 disabled. In this case is the Zabbix server and the Synology in the same LAN, without any firewalls.
This is the error message:

What can I do to monitor a Synology?
Is the template for each disk station different?
I want do it with SNMP, or did I need a agent on the Synoloy?

Thank you very much,
Marcus

[Quintessenz IT]

I found the solution.
I forgot to add the SNMP interface :-(
Now it is working.