helm-external-secrets/docs/snippets/azkv-secret-store-mi.yaml

apiVersion: external-secrets.io/v1
kind: SecretStore
metadata:
  name: azure-store
spec:
  provider:
    # provider type: azure keyvault
    azurekv:
      authType: ManagedIdentity
      # Optionally set the Id of the Managed Identity, if multiple identities are assigned to external-secrets operator
      identityId: "<MI_clientId>"
      # URL of your vault instance, see: https://docs.microsoft.com/en-us/azure/key-vault/general/about-keys-secrets-certificates
      vaultUrl: "https://my-keyvault-name.vault.azure.net"