Azure AI Foundry — Agent Application identity provisioning stuck at "Creating" in East US 2, blocks A2A orchestration with 401

I'm setting up Agent-to-Agent (A2A) orchestration in Azure AI Foundry (New) and both of my published Agent Applications have their identity provisioning permanently stuck at "Creating".

Environment

• Region: East US 2

• API Version: 2025-10-01-preview

Problem

When I query the Agent Application resources via ARM API (GET .../applications/{name}?api-version=2025-10-01-preview), the top-level provisioningState shows "Succeeded", but the nested identity states are stuck:

"agentIdentityBlueprint": { "provisioningState": "Creating" },

"defaultInstanceIdentity": { "provisioningState": "Creating" }

The Entra ID service principals do exist and are enabled — the identities were created, but the provisioning state never transitioned to "Succeeded".

Impact

This blocks A2A tool calls. When my orchestrator agent tries to invoke a sub-agent via the a2a_preview tool, I get:

Error code: tool_user_error

Error message: 400 Failed to fetch agent card: Response status code does not indicate success: 401 (PermissionDenied)

I've verified:

• RBAC is correct: Azure AI User role assigned on the Agent Application resources for both the orchestrator's agentic identity and the project managed identity

• Direct endpoint calls work: Calling the Agent Application endpoint with a user bearer token returns 200 OK

• Auth type doesn't matter: Tested with both AgenticIdentityToken and ProjectManagedIdentity connection types — same 401

• Cannot modify or delete the stuck resources: PUT and DELETE operations return SystemError from managementfrontend in eastus2

Additional details

• Two separate Agent Applications are affected, suggesting this is systemic in the region rather than resource-specific

Questions

1. Is there a known issue with Agent Application identity provisioning in East US 2?

2. Is there a way to re-trigger or unstick the identity provisioning?

3. Would creating the Foundry resource in a different region (e.g., Sweden Central) avoid this issue?