Env variable from AWS Secrets Manager in Kubernetes

In EKS I am trying to use SecretProviderClass to provide secrets as environment variables to containers. I can see the secret mounted inside the container but no combination of key/names is allowing me to use it as an environment variable. Insode the container I cancat /mnt/secrets-store/awscredentialsAnd see the output:

{"accesskey":"ABCDE12345","secretkey":"a/long/redacted5tring"}

My SecretProviderClass is below

apiVersion: secrets-store.csi.x-k8s.io/v1kind: SecretProviderClassmetadata:  name: aws-secrets  namespace: defaultspec:  provider: aws  parameters:    objects: |        - objectName: "path/to/service/awscredentials"          objectType: secretsmanager          objectAlias: awscredentials  secretObjects:  - secretName: awscredentials    type: Opaque    data:     - objectName: accesskeyalias      key: accesskey    - objectName: secretkeyalias      key: secretkey

and my deployment:

apiVersion: apps/v1kind: Deploymentmetadata:  name: myservice  labels:    team: devopsspec:  replicas: 1  selector:    matchLabels:      app: myservice  template:    metadata:      labels:        app: myservice    spec:      serviceAccountName: myservice      volumes:      - name: secrets-store-inline        csi:          driver: secrets-store.csi.k8s.io          readOnly: true          volumeAttributes:            secretProviderClass: "aws-secrets"      containers:      - name: myservice        image: someimage:2        volumeMounts:        - name: secrets-store-inline          mountPath: "/mnt/secrets-store"          readOnly: true        env:        - name: AWS_ACCESS_KEY          valueFrom:            secretKeyRef:              name: awscredentials              key: accesskey

When I run the deployment without reference to the SecretKeyRef the container runs and I can see the secret under /mnt/secrets-store/awscredentials. However, trying to set the environment variable results in the pod stuck in Pending state and the message:Error: secret "awscredentials" not foundI reckon I have mixed up the name and keys somewhere but I've spent hours trying every combination I can think of. What am I missing?