Juniper Chassis Alarms Not Detected

You can check the following two points.

First step → snmpget on the OID .1.3.6.1.2.1.1.2.0 → result should start with .1.3.6.1.4.1.2636.1.1.1
If the first test is successful
snmpget on OID .1.3.6.1.4.1.2636.3.1.10.1.8 this should give you a result different from 1

If the two tests are ok you should get the discovery for this check.