Azure Key Vault certificate's issuer name is not using Azure integrated certificate authorities. This may lead to security issues such as: spoofed identity and inability to revoke the certificates.
Certificate issuers cannot be altered once they are created. To create a new certificate with a valid issuer, follow the steps below.
In Azure Console -
In Terraform -
References:
https://learn.microsoft.com/en-us/azure/key-vault/general/overview
https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/key_vault_certificate#issuer_parameters