Configuring Ingress with a GraphQL Gateway + gRPC Microservices - go

Question

I am looking to deploy a SaaS platform I have built on kubernetes but I have hit a barrier when it comes to setting up the deployment correctly. You can find the setup I am going for
here. I have tried setting up the ingress controller, and it is, in fact forwarding requests to the GraphQL gateway, the problem is that the GraphQL Gateway itself is uncapable of connecting to the other services due to gRPC connection errors. Below you will find my Deployment.yml which contains the graphql gateway, an ingress controller and one service called general
What I am asking basically is how can I connect my gRPC based services to the main GraphQL gateway
apiVersion: v1
kind: Service
metadata:
name: graphql-gateway
spec:
type: ClusterIP
ports:
- port: 80
targetPort: 8080
selector:
app: gateway
---
apiVersion: v1
kind: Service
metadata:
name: general-service
spec:
ports:
- protocol: TCP
port: 443
targetPort: 600
selector:
app: general
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: gateway
spec:
replicas: 2
selector:
matchLabels:
app: gateway
template:
metadata:
labels:
app: gateway
spec:
containers:
- name: gateway
image: myregistry/gateway:latest
imagePullPolicy: "Always"
ports:
- containerPort: 8080
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: general
spec:
replicas: 2
selector:
matchLabels:
app: general
template:
metadata:
labels:
app: general
spec:
containers:
- name: general
image: myregistry/general:latest
imagePullPolicy: "Always"
ports:
- containerPort: 600
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: gateway-ingress
annotations:
kubernetes.io/ingress.class: nginx
nginx.ingress.kubernetes.io/grpc-backend: "true"
spec:
rules:
- host: "playground.mydomain.com"
http:
paths:
- pathType: Prefix
path: "/"
backend:
service:
name: graphql-gateway
port:
number: 80