Velero - Azure Managed Identity Issues

We are trying to implement managed identity in our AKS clusters. We are using steps in below documentation to implement managed identity in our Velero pods.

https://github.com/vmware-tanzu/velero-plugin-for-microsoft-azure#option-2-use-aad-pod-identity

The steps they mentioned is for installation through Velero plugin but we are using helm charts to implement velero in our clusters.

So we followed below steps

1. Installed AAD pod identity.
2. Added aadpodidbinding label to our Velero deployment.
3. Removed service principal details from the velero secret and kept only AZURE_SUBSCRIPTION_ID, AZURE_RESOURCE_GROUP and AZURE_CLOUD_NAME secrets.
4. Restarted our Velero pods.

We are getting below error

{"backupstoragelocation":"default","controller":"backupstoragelocation","error.file":"/go/src/github.com/vmware-tanzu/velero-plugin-for-microsoft-azure/velero-plugin-for-microsoft-azure/object_store.go:147","error.function":"main.getStorageAccountKey","error.message":"rpc error: code = Unknown desc = unable to get all required environment variables: the following keys do not have values: AZURE_TENANT_ID, AZURE_CLIENT_ID, AZURE_CLIENT_SECRET","level":"error","logSource":"pkg/controller/backupstoragelocation_controller.go:87","msg":"Error getting a backup store","time":"2021-08-30T10:30:08Z"}

Please help us fix this issue.