There are lot of things i need to understand in this thread, so let me get started answering your question first
1. The error you pointed out from "ocum-error.log" file. This is related to "ems subscription" setup in UM. You may need to look up what name is setup in cluster (e.g: ::> event notification destination show) and what is the name you have on your UM server, either by looking at the UM certificate or you can use couple of other ways to check the UM hostname
> mysql -e "select * from ocum.managementstation;"
> um cli login -u <maintenance_user>
> um option list custom.hostname
2. The "um option list" output you mention that is showing "ssl.host.verifyCertificates" and "ssl.host.verifyHostNames" option as false and that is true in default configuration after the installation. These option was used in HA and local UM host name configuration settings but we have not tweaked these option when configuring/installing CA certificates.
Clarification:
A) Are you having problem installing CA certificate in UM 9.4? Is the CA certificate hold "intermediate/root" certs and if Yes, is the order correct? May be this KB will help you "https://kb.netapp.com/app/answers/answer_view/a_id/1071340".
B) Which Platform UM 9.4 is installed on "vApp/RHEL/Windows"?
c) If you have no issue installing the CA certificate in UM, After the certificate installation done, are you running into a cluster acquisition issue or adding new cluster or UM do not seems to recognize your new CA certificate?
d) If you dont mind sharing your CA certificate and steps you are talking to install?
I will stop here, may be i am going into complete wrong direction, so lets hear from you and then we will try to help.