I'm trying to use the certificates obtained through digicert to enable https on my nginx-ingress. We've obtained a wildcard certificate and I have the following files.

domain_name_2019-2021.csr
domain_name_2019-2021.key
domain_name_2019-2021.pem
DigiCertCA2_2019-2021.pem
star_domain_name_2019_2021.pem
TrustedRoot.pem

I've created the tls secrets by running the following commands

kubectl create secret tls tls-secret --key ${KEY_FILE} --cert ${CERT_FILE}

And used these secrets in my ingress configuration like so

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: ingress-service
  namespace: default
  annotations:
    kubernetes.io/ingress.class: nginx
    nginx.ingress.kubernetes.io/ssl-passthrough: "true"
    nginx.ingress.kubernetes.io/force-ssl-redirect: "true"
spec:
  tls:
    - hosts:
       - {{ .Values.host }}
      secretName: tls-secret
  rules:
    - host: {{ .Values.host }}
      http:
        paths:
          - path: /
            backend:
              serviceName: service_name
              servicePort: 443

However when browse to subdomain.domain_name.com I get an invalid certificate with an error of This certificate has not been verified by a third party. And the certificate its using says Kubernetes Ingress Controller Fake Certificate