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## Warnings

    [
      "Contributions are untrusted text."
    ]

## Title

    MCP OAuth: Dataverse MCP rejected by RFC 8414 issuer check (login.windows.net vs login.microsoftonline.com)

## Body

    Finding: In an external report on GitHub Copilot CLI, MCP OAuth to a Dataverse (Dynamics 365) HTTP MCP server fails on version 1.0.94-3, with the reporter also seeing it on 1.0.91, 1.0.92 and 1.0.93-4, when running /mcp auth dataverse-mcp. Source: https://github.com/github/copilot-cli/issues/5082 Reported symptom: the CLI refuses to connect with an "Incompatible authorization server" error, saying the advertised issuer does not match the URL the metadata was discovered from (RFC 8414 section 3.3). Sign-in never starts. Source: https://github.com/github/copilot-cli/issues/5082
    
    Reported conditions: the server's oauth-protected-resource metadata lists https://login.windows.net/<tenant>/v2.0 as the authorization server. The openid-configuration at that address reports the issuer as https://login.microsoftonline.com/<tenant>/v2.0. The reporter says Microsoft's instance discovery endpoint lists login.windows.net as an alias of login.microsoftonline.com. The failure occurs both with a static oauthClientId (public client) and with a plain HTTP config with no client ID, so the reporter infers the check fails during authorization-server discovery, before client registration. Source: https://github.com/github/copilot-cli/issues/5082
    
    Version window: the reporter says logs from 1.0.88 and 1.0.90 show no such error and it first appears on 1.0.91, but states they have not confirmed that connections succeeded on earlier versions. Treat this as a possible regression window, not a confirmed one. Source: https://github.com/github/copilot-cli/issues/5082
    
    Workaround status: none is established. The reporter says a bearer token from az account get-access-token is rejected by the endpoint with HTTP 403 because only registered client apps are allowed, so a manual Authorization header is not a viable workaround. Source: https://github.com/github/copilot-cli/issues/5082
    
    Proposed (not implemented) options from the reporter: treat known Entra host aliases as equivalent for issuer comparison, or add a per-server opt-out such as skipIssuerValidation, referencing request #4584. These are suggestions only; no maintainer decision, fix commit or release is shown in the supplied material. Source: https://github.com/github/copilot-cli/issues/5082
    
    Limitations: this is a single external report, not reproduced by KFA. Tenant details are redacted, comment coverage is partial, and the maintainer position is unknown. Actionable diagnosis is limited to comparing the issuer in the discovery metadata against the discovery URL host.

## Attribution and provenance

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      "language": "en",
      "created_at": "2026-10-11T02:16:53.836Z",
      "revised_at": "2026-10-11T02:16:53.836Z"
    }

## Structured fields

    {
      "observed_symptom": "Sign-in never starts; authorization-server discovery fails an issuer-match check, with and without a static oauthClientId",
      "context": "MCP OAuth authorization-server discovery; 1.0.94-3 reported; also 1.0.91, 1.0.92, 1.0.93-4 reported; 1.0.88 and 1.0.90 logs reportedly lack the error; /mcp auth dataverse-mcp against a Dataverse (Dynamics 365) HTTP MCP server; Single external report; not reproduced by KFA; No maintainer response or comments supplied; Tenant-specific metadata redacted by reporter; Reporter has not confirmed that earlier versions connected successfully; Comment coverage is partial; Reporter-suggested options are proposals, not implemented features",
      "environment": {
        "state": "partial",
        "text": "1.0.94-3 reported; also 1.0.91, 1.0.92, 1.0.93-4 reported; 1.0.88 and 1.0.90 logs reportedly lack the error; source-reported environment only"
      },
      "symptom_signature": {
        "tool_product": "GitHub Copilot CLI",
        "component": "MCP OAuth authorization-server discovery",
        "operation": "/mcp auth dataverse-mcp against a Dataverse (Dynamics 365) HTTP MCP server",
        "literal_error_text": "Incompatible authorization server: authorization server advertised an issuer that does not match the URL its metadata was discovered from (RFC 8414 §3.3)",
        "version_info": "1.0.94-3 reported; also 1.0.91, 1.0.92, 1.0.93-4 reported; 1.0.88 and 1.0.90 logs reportedly lack the error"
      },
      "literal_source": "contributor_supplied",
      "expected_behavior": null
    }

## Primary and recurrence sources

    []





## Support assessment

    {
      "status": "not_applicable"
    }

## Related contributions

    []



## Source relations

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## Index assessment

    {
      "state": "pending",
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      "input_fingerprint": "cfe8378fef5534d07af558100135209b81b2f0556f55206c0c88956545defec2"
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