Azure Artifact Signing sign operation returns status Failed with null signature, active Public Trust profile

Azure Artifact Signing / Microsoft.CodeSigning issue.

Account appears healthy, but every sign operation fails after the service accepts the request.

Environment:

• Region: East US
• Endpoint: https://eus.codesigning.azure.net/
• Account provisioningState: Succeeded
• Certificate profile: PublicTrust, provisioningState Succeeded, status Active
• Identity validation: Completed
• Active certificates are present
• Microsoft.CodeSigning provider is Registered
• Signing user has Artifact Signing Certificate Profile Signer role
• SignTool x64 and Azure.CodeSigning.Dlib 1.0.119 are installed
• .NET 8 runtime installed

Failure:

Sign request is submitted successfully, then operation resolves to:

{

"status": "Failed",

"signature": null,

"signingCertificate": null,

"counterSignature": null

}

Reproduced with:

• Bahast.exe
• Tiny throwaway test EXE
• SignTool + Azure.CodeSigning.Dlib
• .NET sign tool / Artifact Signing client
• With timestamping and without timestamping
• Minimal metadata and metadata with ExcludeCredentials

Recent operation IDs:

• PII

New Public Trust profile creation attempts also reached terminal provisioningState Failed, and failed profile deletes also failed.

Can the Artifact Signing backend team check whether this account/profile/identity validation is stuck, suspended, or blocked server-side?