I cant get my pods to communicate using a service - kubernetes

Question

When I try using a service to read from my backend (written in ASP.NET Core) in my front (in Angular). I can read this screenshot 1 in the browser console and it doesn't get the information from the API pod.
I have two kubernetes deployment and each one has a service, they are created by this YAML file:
apiVersion: apps/v1
kind: Deployment
metadata:
name: dotnet-angular-deployment
spec:
selector:
matchLabels:
app: dotnet-angular-pod
replicas: 1
template:
metadata:
labels:
app: dotnet-angular-pod
run: dotnet-angular-pod
spec:
containers:
- name: dotnet-angular-container
image: dotnet-angular
imagePullPolicy: IfNotPresent
resources:
requests:
memory: "64Mi"
cpu: "250m"
limits:
memory: "512Mi"
cpu: "500m"
ports:
- containerPort: 80
protocol: TCP
---
apiVersion: v1
kind: Service
metadata:
name: dotnet-angular-service
labels:
run: dotnet-angular-pod
spec:
ports:
- port: 80
protocol: TCP
targetPort: 80
nodePort: 32000
selector:
app: dotnet-angular-pod
type: NodePort
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: dotnetangularapi-deployment
spec:
selector:
matchLabels:
app: dotnetangularapi-pod
replicas: 2
template:
metadata:
labels:
app: dotnetangularapi-pod
run: dotnetangularapi-pod
spec:
containers:
- name: dotnetangularapi-container
image: dotnetangularapi
imagePullPolicy: IfNotPresent
resources:
requests:
memory: "64Mi"
cpu: "250m"
limits:
memory: "512Mi"
cpu: "500m"
ports:
- containerPort: 80
protocol: TCP
env:
- name: ASPNETCORE_URLS
value: http://+:80
---
apiVersion: v1
kind: Service
metadata:
name: dotnetangularapi-service
labels:
run: dotnetangularapi-pod
spec:
ports:
- port: 80
protocol: TCP
targetPort: 80
nodePort: 31000
selector:
app: dotnetangularapi-pod
type: NodePort
---
In my Angular app when I call the backend I write http://dotnetangularapi-service/demo the controller I want to access is DemoController.cs thus the /demo.
I can't understand why the browser sends an ERR_NAME_NOT_RESOLVE and I can't even understand what the second error means.