To repackage the certificate keystore, rebuild the keystore using the old one.
1. Extract Private key from the old keystore to private-key.pem
openssl pkcs12 -in <oldkeystorefile>.pfx -nocerts -out private-key.pem -nodes
2. Extract the certificate to certificate.pem
openssl pkcs12 -in <oldkeystorefile>.pfx -nokeys -out certificate.pem
3. Open certificate.pem in a text editor
Copy 1st Certificate from "----BEGIN CERTIFICATE-----" to "-----END CERTIFICATE-----" to file called ssl_cert.pem

Copy next 2 or more certificates from "----BEGIN CERTIFICATE-----" to "-----END CERTIFICATE-----" to file called ssl_intermediateandroot.pem


4. Verify ssl cert.
openssl x509 -text -noout -in ssl_cert.pem
All certificate details are not shown above5. Verify certificate chain.
openssl x509 -text -noout -in ssl_intermediateandroot.pem
All certificate details are not shown above6. Export combined pfx file
openssl pkcs12 -export -out ssl_cert_with_full_chain.pfx -inkey private-key.pem -in ssl_cert.pem -certfile ssl_intermediateandroot.pem

Note: This step will ask for a password.
7. Upload output to the CEM server.
Problem Cause
The certificate keystore is improperly packaged.