Hello @gongomgra that was the same problem from the beginning.
I have restarted apache and requested new certificates, but I always get an error that says that a certificate was found and could not be revoked. You gave me a link to revoke the existing certs manually, I did that, still the same problem.
Now, I have revoked, I have requested new cert, but I'm still getting the same error. I used the bncert-tool to request new cert but it's still giving me that same error.
Do I need to delete the old cert file altogether and just run the bncert tool again? If yes, kindly show me how to do that.