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codex - 💡(How to fix) Fix Official Meta Ads MCP fails OAuth login with invalid_client_metadata

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Official Meta Ads MCP login fails in Codex before the browser/OAuth consent flow opens.

MCP server:

https://mcp.facebook.com/ads

Codex reports:

Error: Registration failed: Dynamic registration failed: Registration failed: HTTP 400 Bad Request: {"error":"invalid_client_metadata","error_description":"Dynamic registration is not available for this client."}

Error Message

Error: Registration failed: Dynamic registration failed: Registration failed: HTTP 400 Bad Request: {"error":"invalid_client_metadata","error_description":"Dynamic registration is not available for this client."}

Root Cause

Official Meta Ads MCP login fails in Codex before the browser/OAuth consent flow opens.

MCP server:

https://mcp.facebook.com/ads

Codex reports:

Error: Registration failed: Dynamic registration failed: Registration failed: HTTP 400 Bad Request: {"error":"invalid_client_metadata","error_description":"Dynamic registration is not available for this client."}

Code Example

https://mcp.facebook.com/ads

---

Error: Registration failed: Dynamic registration failed: Registration failed: HTTP 400 Bad Request: {"error":"invalid_client_metadata","error_description":"Dynamic registration is not available for this client."}

---

[mcp_servers.meta_ads_mcp]
enabled = true
url = "https://mcp.facebook.com/ads"

---

codex mcp login meta_ads_mcp
RAW_BUFFERClick to expand / collapse

Summary

Official Meta Ads MCP login fails in Codex before the browser/OAuth consent flow opens.

MCP server:

https://mcp.facebook.com/ads

Codex reports:

Error: Registration failed: Dynamic registration failed: Registration failed: HTTP 400 Bad Request: {"error":"invalid_client_metadata","error_description":"Dynamic registration is not available for this client."}

Environment

  • Codex CLI: 0.130.0
  • Also reproduced with: npx @openai/[email protected]
  • Platform: Linux server over SSH / Codex desktop remote
  • MCP config:
[mcp_servers.meta_ads_mcp]
enabled = true
url = "https://mcp.facebook.com/ads"

Reproduction

  1. Add the official Meta Ads MCP server with URL https://mcp.facebook.com/ads.

  2. Click Authenticate in Codex UI, or run:

    codex mcp login meta_ads_mcp

  3. No browser consent flow opens.

  4. Login fails during dynamic client registration with invalid_client_metadata.

Expected behavior

Codex should complete OAuth login for the official Meta Ads MCP server, or support the client metadata/static client identity required by Meta's hosted MCP OAuth flow.

Notes

This appears related to #19154, but this case is for Meta's official hosted Ads MCP endpoint rather than a private/internal OAuth server.

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FAQ

Expected behavior

Codex should complete OAuth login for the official Meta Ads MCP server, or support the client metadata/static client identity required by Meta's hosted MCP OAuth flow.

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