Kubernetes cert-manager certificate is created but can not get vertified - ssl

Question

I am working on a DO kubernetes cluster and install ingress nginx and argocd on it, All seems fine and I can easily use the ingress as long as they are accessing the services via http.
I have also installed certmanager and here are the main files regarding my ingress, certificate and issuer:
Ingress
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: rancher-demo
annotations:
kubernetes.io/ingress.class: nginx
nginx.ingress.kubernetes.io/rewrite-target: /
certmanager.k8s.io/cluster-issuer: "letsencrypt-production"
nginx.ingress.kubernetes.io/ssl-redirect: "true"
spec:
tls:
- hosts:
- {sub-domain}
secretName: ssl-cert-production
rules:
- host: {sub-domain}
http:
paths:
- path: /
pathType: Prefix
backend:
service:
name: rancher-demo
port:
number: 80
Issuer
apiVersion: cert-manager.io/v1
kind: ClusterIssuer
metadata:
name: letsencrypt-production
namespace: default
spec:
acme:
server: https://acme-v02.api.letsencrypt.org/directory
email: {my-email}
privateKeySecretRef:
name: letsencrypt-production
solvers:
- selector: {}
http01:
ingress:
class: nginx
Certificate
apiVersion: cert-manager.io/v1
kind: Certificate
metadata:
name: ssl-cert-production
namespace: default
spec:
secretName: ssl-cert-production
issuerRef:
name: letsencrypt-production
kind: ClusterIssuer
commonName: {sub-domain}
dnsNames:
- {sub-domain}
I went through some other samples on github and questions on stackoverflow and unfortunetly I can not figure out where I am doing it wrong.
Thank you in advance for your attentions

Answer 1

I finally managed to fix the issue, what I have done was as follow:
creating a new kubernete instance
installing cert-manager manaully
installing ingress-nginx manaully
creating the issuer (waiting for it to complete)
creating deployment and cluster
creating ingress config for my application
creating the certificate (waiting for it to complete)
I was working on ArgoCD and had to first do these setups myself before handling CD with Argo. It was my own fault that I did not properly go through their documentations. The order is important, but the way I sat up Argo, it was provisioing everything in parallel so for example certificate was being provision before ingress be up or issuer be in place
Also for anyone who is interested in a detailed version please checkout the github repo I created below:
https://github.com/mehdiamenein/cert-manager-nginx-ingress-do
I hope this can be helpful to someone else as well :)
Huge thanks to marcel.dempers for his wonderful video https://www.youtube.com/watch?v=hoLUigg4V18
and many thanks to #justin and #harsh-manvar for their comments