A certificate will only work with its mathematically unique private key that was created during CSR creation. That error is suggesting that the certificate you are using does not match the private key. You need to make sure you are using the correct private key to the certificate that was issued to you. if you cant find it or are still having problems.
Error in Certificates - Add: Certificate creation failed
key values mismatch - X509_check_private_key - b080074
More than likely you'll need to create a new CSR/Private key and replace the certificate (Keep track of your new private key this time)
Majority of the time its best to create the CSR/Private key off the application/server to plan on running the certificate-keypair or website. to avoid complications like mix matching keys and such.