I found the fix from Oracle Support Knowlededge Base
sslTool serverInfo --url https://HOST:9043 --certFile newcert.cer
PStoreTool located in REGISTRY_HOME/bin/PStoreTool add -config
WEBLOGIC_HOME/user_projects/domains/[osr_domain_name]/servers/[osr_server_name]/tmp/_WL_user/registry/[unique id]/public/conf/pstore.xml -certFile newcert.cer
I was updating wrong file with the certificate. It had to be pstore.xml. This solved my issue.
Thanks & Regards,