Get-AzRecoveryServicesBackupItem doesn't filter Windows containers by workload type

[v-dwill1]

I am using PS to delete a recovery services vault. I am disabling protection after getting all containers. Here is the snippet.:

Try {
$VMContainers = Get-AzRecoveryServicesBackupContainer -VaultId $vault.id -ContainerType AzureVM
$StorageContainers = Get-AzRecoveryServicesBackupContainer -VaultId $vault.id -ContainerType AzureStorage
$VMAppContainers = Get-AzRecoveryServicesBackupContainer -VaultId $vault.id -ContainerType AzureVMAppContainer
$MABContainers = Get-AzRecoveryServicesBackupContainer -VaultId $vault.id -ContainerType Windows -BackupManagementType MAB
}
Catch {
$getBckpErr = $_
}

My issue is when finding Windows containers, I try to filter for workload type (as follow):

Set-AzRecoveryServicesVaultContext -Vault $vault

Foreach ($container in $MABContainers) {

$VMBackupItem = Get-AzRecoveryServicesBackupItem -Container $container -WorkloadType AzureVM -EA SilentlyContinue
$FilesBackupItem = Get-AzRecoveryServicesBackupItem -Container $container -WorkloadType AzureFiles -EA SilentlyContinue
$MSSQLBackupItem = Get-AzRecoveryServicesBackupItem -Container $container -WorkloadType MSSQL -EA SilentlyContinue
$FileFolderBackupItem = Get-AzRecoveryServicesBackupItem -Container $container -WorkloadType FileFolder -EA SilentlyContinue
$SAPHanaDatabaseBackupItem = Get-AzRecoveryServicesBackupItem -Container $container -WorkloadType SAPHanaDatabase -EA SilentlyContinue}

Checking these variables yields the first issue: they all contain the SAME backup item of 'FileFolder' workload type.

FriendlyName ContainerType ContainerUniqueName WorkloadType LastBackupStatus

---

C:\ Windows {containername}.europe.corp.microsoft.com FileFolder Completed

Then, when trying to remove the container using:

Disable-AzRecoveryServicesBackupProtection -Item $vmbitem -VaultId $vault.Id -RemoveRecoveryPoints -Force
Disable-AzRecoveryServicesBackupProtection -Item $vmbitem -RemoveRecoveryPoints -Force

I get this error:

Disable-AzRecoveryServicesBackupProtection: Unsupported WorkloadType: FileFolder

I read somewhere that I can achieve the deletion if I switch from the cmdlets to the REST API, but how can I rely on the Get-AzRecoveryServicesBackupItem command to filter the correct workload type?

I ran the command with the -Debug switch, and the API URi behind the command doesn't include the "-WorkloadType FileFolder" part of the command as part of the query filter.:

DEBUG: ============================ HTTP REQUEST ============================

HTTP Method:
GET

Absolute Uri:
https://management.azure.com/subscriptions/959e73d4-6e8c-4aea-a858-f842a23fed90/resourceGroups/InternalRG/providers/Microsoft.RecoveryServices/vaults/InternalRecoveryVault/backupProtectedItems?$filter=backupManagementType eq 'MAB'&api-version=2023-04-01

Can someone help?