unable to add azure fileshare to Recovery service vault backup policy through az cli command

i am trying add AzureFileshare to recovery service vault backup policy through Az cli command in azure devops pipeline. but i could not succeed. below is the cli command

az backup protection enable-for-azurefileshare --resource-group vaultresourcegroup -- 
vault-name rsvault --policy-name filesharepolicy --storage-account sasample --azure-file- 
share fileshare1

below is the error i am getting

ERROR: Storage not found or not Supported.

am i missing anything here.

ERROR: Storage not found or not supported.

According to this MS-Document, the above error occurs when the storage account may have been deleted or created in a different region (like France or Germany).

When I tried with a different region like (France) for the storage account, I too got the same error:

When I tried with the same region like (East US) for the storage account, it created a backup policy for the file share.

Command and output:

az backup protection enable-for-azurefileshare --policy-name policy1 --resource-group xxx --vault-name  azurefilesvault --storage-account "venkat789" --azure-file-share "share3" --output table
Name                                  ResourceGroup
------------------------------------  ---------------------
6b9c06e7-4277-xxxxxx                  xxxx

Portal:

Reference: Support Matrix for Azure file share backup by using Azure Backup - Azure Backup | Microsoft Learn