In the message below i see no error message. What is missing in your command is to do first an discovery of your check. This needs to be done with “-I” ← capital i.
But i would not recommend to use the “–detect-plugins” options. This will hide that your “detect” statements inside the “SimpleSNMPSection” is potential not working.
Instead of “startswith” you should use “exists” if you only want to check that this OID is existing.
After you have found a new service with the service discovery, you can run your command again without the “-I” and you should see something. Check result or error message 