We'll issue a certificate with the 1st change, but by the sound of it, that second field needing to change means that even a reissued certificate won't solve the problem.
In order to avoid this, the certificate's Subject must be the same between the two certificates.
A SERIALNUMBR field in the Subject itself. The provider said that this is unique to every certificate and so a reissue will have a different value
To be fully honest with you, I was not aware of this scenario - e.g. a unique serial number being input into the Subject
As I have mentioned above, as far as I know, the certificates' Subject must be the exact same.
I will try to discuss this with our developement team to see if perhaps there is some other way around this, but I honestly doubt.