Can't access EKS cluster from CodeBuild

Already saw this particular post kubectl error You must be logged in to the server (Unauthorized) when accessing EKS cluster and followed some guides from AWS but still no success..

I'm creating a CI/CD pipeline. But CodeBuild is apparently not authorized to access the EKS cluster. I went to the specific CodeBuild role and added the following policies:

AWSCodeCommitFullAccess
AmazonEC2ContainerRegistryFullAccess
AmazonS3FullAccess
CloudWatchLogsFullAccess
AWSCodeBuildAdminAccess

Also created and added the following policy:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": "eks:*",
            "Resource": "*"
        }
    ]
}

Afterwards I executed the following command in the terminal where I created the EKS cluster: eksctl create iamidentitymapping --cluster <my_cluster_name> --arn <arn_from_the_codebuild_role> --group system:masters --username admin

And checked if it successfully added to aws-auth by running the command kubectl get configmaps aws-auth -n kube-system -o yaml. It returned:

apiVersion: v1
data:
  mapRoles: |
    - groups:
      - system:bootstrappers
      - system:nodes
      rolearn: arn:aws:iam::********:role/*********
      username: system:node:{{EC2PrivateDNSName}}
    - groups:
      - system:masters
      rolearn: arn:aws:iam::*****:role/service-role/*******
      username: ******
  mapUsers: |
    []
kind: ConfigMap
metadata:
  creationTimestamp: "2021-11-10T07:37:06Z"
  name: aws-auth
  namespace: kube-system
  resourceVersion: *******
  uid: *********

Still I get the error it's unauthorized.. Below is the buildspec.yml file:

version: 0.2
run-as: root

phases:

  install:
    commands:
      - echo Installing app dependencies...
      - chmod +x prereqs.sh
      - sh prereqs.sh
      - source ~/.bashrc
      - echo Check kubectl version
      - kubectl version --short --client

  pre_build:
    commands:
      - echo Logging in to Amazon EKS...
      - aws eks --region eu-west-2 update-kubeconfig --name <my-cluster-name>
      - echo Check config
      - kubectl config view
      - echo Check kubectl access
      - kubectl get svc

  post_build:
    commands:
      - echo Push the latest image to cluster
      - kubectl apply -n mattermost-operator -f mattermost-operator.yml
      - kubectl rollout restart -n mattermost-operator -f mattermost-operator.yml

EDIT:

Running the command kubectl config view in CodeBuild returns:

apiVersion: v1
clusters:
- cluster:
    certificate-authority-data: DATA+OMITTED
    server: https://**********eu-west-2.eks.amazonaws.com
  name: arn:aws:eks:eu-west-2:**********:cluster/<cluster_name>
contexts:
- context:
    cluster: arn:aws:eks:eu-west-2:**********:cluster/<cluster_name>
    user: arn:aws:eks:eu-west-2:**********:cluster/<cluster_name>
  name: arn:aws:eks:eu-west-2:**********:cluster/<cluster_name>
current-context: arn:aws:eks:eu-west-2:**********:cluster/<cluster_name>
kind: Config
preferences: {}
users:
- name: arn:aws:eks:eu-west-2:**********:cluster/<cluster_name>
  user:
    exec:
      apiVersion: client.authentication.k8s.io/v1alpha1
      args:
      - --region
      - eu-west-2
      - eks
      - get-token
      - --cluster-name
      - <cluster_name>
      - --role
      - arn:aws:iam::*********:role/service-role/<codebuild_role>
      command: aws
      env: null

Running the command kubectl config view in the terminal where I created the EKS cluster returns:

apiVersion: v1
clusters:
- cluster:
    certificate-authority-data: DATA+OMITTED
    server: ***********eu-west-2.eks.amazonaws.com
  name: arn:aws:eks:eu-west-2:*******:cluster/<cluster_name>
- cluster:
    certificate-authority-data: DATA+OMITTED
    server: *********eu-west-2.eks.amazonaws.com
  name: <cluster_name>.eu-west-2.eksctl.io
contexts:
- context:
    cluster: arn:aws:eks:eu-west-2:*******:cluster/<cluster_name>
    user: arn:aws:eks:eu-west-2:*******:cluster/<cluster_name>
  name: arn:aws:eks:eu-west-2:*******:cluster/<cluster_name>
- context:
    cluster: <cluster_name>.eu-west-2.eksctl.io
    user: ******@<cluster_name>.eu-west-2.eksctl.io
  name: ******@<cluster_name>.eu-west-2.eksctl.io
current-context: arn:aws:eks:eu-west-2:********:cluster/<cluster_name>
kind: Config
preferences: {}
users:
- name: arn:aws:eks:eu-west-2:*******:cluster/<cluster_name>
  user:
    exec:
      apiVersion: client.authentication.k8s.io/v1alpha1
      args:
      - --region
      - eu-west-2
      - eks
      - get-token
      - --cluster-name
      - <cluster_name>
      command: aws
      env: null
      interactiveMode: IfAvailable
      provideClusterInfo: false
- name: ******@******.eu-west-2.eksctl.io
  user:
    exec:
      apiVersion: client.authentication.k8s.io/v1alpha1
      args:
      - token
      - -i
      - <cluster_name>
      command: aws-iam-authenticator
      env:
      - name: AWS_STS_REGIONAL_ENDPOINTS
        value: regional
      - name: AWS_DEFAULT_REGION
        value: eu-west-2
      interactiveMode: IfAvailable
      provideClusterInfo: false

ANYBODY IDEAS PLS? :D

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