Add-AzVhd throws exception on successful VHD upload in Azure Government (HTTP 200 OK treated as error)

[staticglobal]

Description

`Add-AzVhd` throws a terminating error when uploading a VHD in an Azure Government environment, even though the upload completes successfully. The underlying storage backend returns HTTP `200 OK` for the upload operation; the cmdlet appears to expect `201 Created` and treats the `200` response as a failure.

This is consistent with the Disks - Grant Access REST API spec, which documents `200 OK` as a valid synchronous-success response — so Azure Gov is behaving correctly. The cmdlet's SDK layer does not appear to handle the `200` path.

Expected behavior: Upload completes without error.
Actual behavior: Exception thrown despite successful upload; blob is present and correctly sized in storage.

Issue Script & Debug Output

$DebugPreference = 'Continue'
Add-AzVhd `
    -ResourceGroupName "<resource-group>" `
    -Destination "https://<storage>.blob.core.usgovcloudapi.net/vhds/<name>.vhd" `
    -LocalFilePath "<path-to-local.vhd>" `
    -ErrorAction Stop

Run against an Azure Government subscription. Upload will throw an exception while the blob is successfully created in storage.

Environment Data

Name                           Value
----                           -----
PSVersion                      7.5.4
PSEdition                      Core
GitCommitId                    7.5.4
OS                             Microsoft Windows 10.0.26100
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Module Versions

Az.Accounts  4.0.0
Az.Compute   9.0.0
Az.Storage   8.0.0

Error Output

Not available — error was not captured at time of discovery.

Workaround

Wrap the call in `try/catch` and verify blob existence and size before re-throwing:

try {
    Add-AzVhd -ResourceGroupName $rg -Destination $dest -LocalFilePath $local -ErrorAction Stop
} catch {
    $blob = Get-AzStorageBlob -Container $container -Context $ctx | Where-Object { $_.Name -eq $blobName }
    if (-not $blob -or $blob.Length -ne (Get-Item $local).Length) { throw }
    Write-Host "Upload completed (Add-AzVhd returned non-standard status in Azure Gov)."
}

[microsoft-github-policy-service]

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @Drewm3, @TravisCragg-MSFT, @nikhilpatel909, @sandeepraichura, @hilaryw29, @GabstaMSFT, @ramankumarlive, @ushnaarshadkhan.

[microsoft-github-policy-service]

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @Drewm3, @TravisCragg-MSFT, @nikhilpatel909, @sandeepraichura, @hilaryw29, @GabstaMSFT, @ramankumarlive, @ushnaarshadkhan.

[microsoft-github-policy-service]

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @Drewm3, @TravisCragg-MSFT, @nikhilpatel909, @sandeepraichura, @hilaryw29, @GabstaMSFT, @ramankumarlive, @ushnaarshadkhan.