generated: '2026-09-19'
method: searched
source: live probes of API + identity hosts
note: 'The Microsoft Graph data-plane host (graph.microsoft.com) returns 401 on all /.well-known/ paths
  — the surface is auth-gated, not publicly discoverable. The OAuth 2.0 / OpenID Connect discovery document
  that governs Outlook API auth is published by the Microsoft identity platform (login.microsoftonline.com).


  MCP-host OAuth discovery added 2026-09-19 (roadmap#321/#337): the harvest visits a provider''s primary
  hosts, and RFC 9728 protected-resource metadata lives on the MCP host, so these documents existed and
  were invisible to the scorer. Fetched live and validated on `resource`/`issuer`; one negative control
  per host.'
hosts:
- host: https://login.microsoftonline.com/common/v2.0
  documents:
  - path: /.well-known/openid-configuration
    status: 200
    file: microsoft-outlook-openid-configuration.json
- host: https://graph.microsoft.com
  documents:
  - path: /.well-known/openid-configuration
    status: 401
  - path: /.well-known/oauth-authorization-server
    status: 401
  - path: /.well-known/security.txt
    status: 401
  - path: /.well-known/api-catalog
    status: 401
- host: https://mcp.svc.cloud.microsoft
  documents:
  - path: /.well-known/oauth-protected-resource
    status: 200
    file: microsoft-outlook-mcp-oauth-protected-resource.json
    bytes: 295
  path_echo_control: passed
- host: https://login.microsoftonline.com
  documents:
  - path: /organizations/v2.0/.well-known/openid-configuration
    status: 200
    file: microsoft-outlook-login-openid-configuration.json
    bytes: 1777
  path_echo_control: passed
x-mcp-probe:
  probed: '2026-09-19'
  issue: roadmap#321, roadmap#337
  documents:
  - host: https://mcp.svc.cloud.microsoft
    path: /.well-known/oauth-protected-resource
    file: microsoft-outlook-mcp-oauth-protected-resource.json
  - host: https://login.microsoftonline.com
    path: /organizations/v2.0/.well-known/openid-configuration
    file: microsoft-outlook-login-openid-configuration.json
  validated_on: resource (RFC 9728) / issuer (RFC 8414, OIDC)
  negative_control: one per host; a 2xx JSON object at an impossible path discards the host