Kubernetes Communication Issues - kubernetes

Question

I have a Kubernetes ingress rule set as;
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: ingress-svc
annotations:
alb.ingress.kubernetes.io/scheme: internet-facing
alb.ingress.kubernetes.io/target-type: IP
spec:
ingressClassName: alb
rules:
- host: api.example.com
http:
paths:
- path: /api/service1
pathType: Prefix
backend:
service:
name: svc-service1
port:
number: 3000
- path: /api/service/service2
pathType: Prefix
backend:
service:
name: svc-service2
port:
number: 3000
- path: /api/service/service3
pathType: Prefix
backend:
service:
name: svc-service3
port:
number: 3000
- path: /api/service/service4
pathType: Prefix
backend:
service:
name: svc-service4
port:
number: 3000
When I try to access api.example.com/api/service1 it gets the required data from the service SERVICE1 but when I try to access a path in SERVICE2 which makes a request to SERVICE1, I get a 504 Gateway Time-out error.
I have tried accessing SERVICE1 from SERVICE2 using the clusterIP but to no avail and I even tried to access it from SERVICE2 using Axios and SERVICE1 path api.example.com/api/service1 but to no avail.
My services are structured as;
apiVersion: apps/v1
kind: Deployment
metadata:
name: svc-service1
spec:
selector:
matchLabels:
app: svc-service1
replicas: 1
strategy:
rollingUpdate:
maxSurge: 25%
maxUnavailable: 25%
type: RollingUpdate
template:
metadata:
labels:
app: svc-service1
spec:
containers:
- name: svc-service1
image: IMAGE_PATH
# imagePullPolicy: IfNotPresent
env:
- name: ENV_VAR_1
value: ENV_VAR_VALUE_1
ports:
- containerPort: 3000
protocol: TCP
# restartPolicy: Always
---
apiVersion: v1
kind: Service
metadata:
name: svc-service1
spec:
selector:
app: svc-service1
type: ClusterIP
ports:
- name: svc-service1
protocol: TCP
port: 3000
targetPort: 3000