K8S Ingress controller, Cert manager and LetsEncrypt SSL doesn't working - nginx

Question

I have created a brand new K8S cluster
I have created the Ingress nginx controller.
The controller created a namespace with all of the required Pods, Svcs and etc.
I have created an Ingress object that routes the traffic to a Deployment service with TLS enabled.
I have created a cluster issuer object.
When inspecting the kubectl describe cert everything okay and ready.
When inspecting the kubectl describe clusterissuer, as well.
When doing curl https://example.com/ it returns the following error:
curl: (60) SSL certificate problem: unable to get local issuer certificate
More details here: https://curl.haxx.se/docs/sslcerts.html
curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the web page mentioned above.
Without SSL, the access is enabled from outside and works properly, when adding back the SSL configuration in the Ingress object, it fails again.
ingress.yaml:
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: minimal-ingress
annotations:
cert-manager.io/cluster-issuer: "letsencrypt-prod"
spec:
tls:
- hosts:
- k8s-poc.example.com
secretName: echo-tls
rules:
- host: k8s-poc.example.com
http:
paths:
- path: /
pathType: Prefix
backend:
service:
name: test-svc
port:
number: 3333
test-depl.yaml:
apiVersion: apps/v1
kind: Deployment
metadata:
name: test-depl
labels:
app: test
spec:
replicas: 1
selector:
matchLabels:
app: test
template:
metadata:
labels:
app: test
spec:
containers:
- name: test
image: mydockeruser/test:42
ports:
- containerPort: 3333
imagePullSecrets:
- name: docker-regcred
terminationGracePeriodSeconds: 30
---
apiVersion: v1
kind: Service
metadata:
name: test-svc
spec:
selector:
app: test
ports:
- name: http
protocol: TCP
port: 3333
targetPort: 3333
prod-issuer.yaml:
apiVersion: cert-manager.io/v1alpha2
kind: ClusterIssuer
metadata:
name: letsencrypt-prod
namespace: cert-manager
spec:
acme:
# The ACME server URL
server: https://acme-v02.api.letsencrypt.org/directory
# Email address used for ACME registration
email: my#email.com
# Name of a secret used to store the ACME account private key
privateKeySecretRef:
name: letsencrypt-prod
# Enable the HTTP-01 challenge provider
solvers:
- http01:
ingress:
class: nginx