Vault PKI Cert secret Engine unable to import or upload PEM certficate

HI ALL,

we are like to implement Hashicorp Vualt as alternate for azure key vault in our project. we are blocked in PKI cert concepts where we trying to upload a PEM bundle in configure CA which contain private key for the certificate throwing an Error Refusing to import non CA certificate any suggestions help to resolve

vault

Vault says your certificate is not a CA certificate.

Import a certificate that is a CA certificate instead.