Skip AcquireTokenWithMtlsPop test: AAD westus3 test slice returns Bearer#3892
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The E2E test AcquireTokenWithMtlsPop_WithBindingCertificate_ReturnsMtlsPopToken fails consistently in the PR pipeline with: MsalClientException: You asked for token type mtls_pop, but receive Bearer. Root cause is server-side: the AAD westus3 test-slice mtlsauth endpoint is downgrading token_type=mtls_pop responses to Bearer. MSAL is correctly routing to westus3.mtlsauth.microsoft.com, sending token_type=mtls_pop, and presenting the SNI cert. The matching MSAL.NET test against the global mtlsauth.microsoft.com endpoint continues to pass, isolating the issue to the test slice — not a Microsoft.Identity.Web or MSAL regression. Skip the test via [Fact(Skip = "...")] (the repo's established pattern for known-broken external-dependency tests) until the AAD test slice honors token_type=mtls_pop again. Tracking: #3891 Related: AzureAD/microsoft-authentication-library-for-dotnet#6084 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Avery-Dunn
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RyAuld
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Pinned [Microsoft.Identity.Web](https://github.com/AzureAD/microsoft-identity-web) at 4.11.0. <details> <summary>Release notes</summary> _Sourced from [Microsoft.Identity.Web's releases](https://github.com/AzureAD/microsoft-identity-web/releases)._ ## 4.11.0 ## What's Changed * Bump vitest from 3.2.4 to 4.1.0 in /tests/DevApps/SidecarAdapter/typescript by @dependabot[bot] in AzureAD/microsoft-identity-web#3836 * Bump MSAL.NET to 4.84.2 and align OWIN binding redirects by @gladjohn with @Copilot in AzureAD/microsoft-identity-web#3844 * docs(design): devex proposal for mTLS PoP on Managed Identity and FIC by @gladjohn in AzureAD/microsoft-identity-web#3832 * Prevent OpenIdConnectMiddlewareDiagnostics from logging sensitive values by @iarekk in AzureAD/microsoft-identity-web#3850 * Add MSI mTLS PoP support: pure MI + FIC-with-MI (impl for devex #3832) by @gladjohn in AzureAD/microsoft-identity-web#3839 * docs(design): devex proposal for Bearer tokens with bound credentials by @gladjohn in AzureAD/microsoft-identity-web#3833 * Add bound-credential support for Bearer tokens (cert + mTLS) by @gladjohn in AzureAD/microsoft-identity-web#3835 * Upgrade IdWeb Sidecar to .NET 10 (LTS) by @soodt in AzureAD/microsoft-identity-web#3841 * MTLS Without Tokens Support - MicrosoftIdentityMessageHandler Support by @tlupes in AzureAD/microsoft-identity-web#3815 * fix: include isTokenBinding in CCA cache key to prevent bearer/PoP collision by @gladjohn in AzureAD/microsoft-identity-web#3867 * Test + doc: x-ms-tokenboundauth header for AKV mTLS PoP via ExtraHeaderParameters by @gladjohn in AzureAD/microsoft-identity-web#3864 * Add mTLS PoP Copilot skill (certificate, MSI, FIC) by @gladjohn in AzureAD/microsoft-identity-web#3872 * Fix CVE-2026-48109: Pin MessagePack to patched version 2.5.301 by @soodt in AzureAD/microsoft-identity-web#3865 * Sidecar: gate agent identity parameters behind AllowOverrides by @iNinja in AzureAD/microsoft-identity-web#3871 * Bump System.Formats.Asn1 base version to 10.0.2 by @iarekk in AzureAD/microsoft-identity-web#3875 * Bump Microsoft.IdentityModel.* from 8.18.0 to 8.19.1 by @iarekk in AzureAD/microsoft-identity-web#3879 * Use IIdentityLogger for MSAL logging in TokenAcquisition and ManagedIdentityClientAssertion (#3820) by @neha-bhargava in AzureAD/microsoft-identity-web#3880 * Update Microsoft.Identity.Abstractions to 12.2.0 and MSAL to 4.85.0 by @neha-bhargava in AzureAD/microsoft-identity-web#3881 * Surface MSAL AuthenticationResultMetadata + exception details on AcquireTokenResult by @neha-bhargava in AzureAD/microsoft-identity-web#3856 * Flow outgoing request to header providers via AcquireTokenOptions by @neha-bhargava in AzureAD/microsoft-identity-web#3876 * Throw on Authority vs Instance/TenantId conflict (OIDC + MSAL parity) by @iarekk in AzureAD/microsoft-identity-web#3873 * Delete .github/workflows/evergreen.yml by @bgavrilMS in AzureAD/microsoft-identity-web#3803 * Add comprehensive authority configuration and precedence documentation by @jmprieur with @Copilot in AzureAD/microsoft-identity-web#3617 * Bump js-yaml from 4.1.1 to 4.2.0 in /tests/DevApps/SidecarAdapter/typescript by @dependabot[bot] in AzureAD/microsoft-identity-web#3862 * Move authority docs into docs/authority-configuration/ subfolder by @iarekk in AzureAD/microsoft-identity-web#3885 * Revert "Throw on Authority vs Instance/TenantId conflict (#3873)" by @iarekk in AzureAD/microsoft-identity-web#3888 * Update Microsoft.Identity.Client to 4.85.1 by @neha-bhargava in AzureAD/microsoft-identity-web#3889 * Enable E2E test coverage on internal Azure DevOps pipelines by @gladjohn in AzureAD/microsoft-identity-web#3883 * Bump esbuild and tsx in /tests/DevApps/SidecarAdapter/typescript by @dependabot[bot] in AzureAD/microsoft-identity-web#3859 * Skip AcquireTokenWithMtlsPop test: AAD westus3 test slice returns Bearer by @neha-bhargava in AzureAD/microsoft-identity-web#3892 ## New Contributors * @iarekk made their first contribution in AzureAD/microsoft-identity-web#3850 * @soodt made their first contribution in AzureAD/microsoft-identity-web#3841 **Full Changelog**: AzureAD/microsoft-identity-web@4.10.0...4.11.0 Commits viewable in [compare view](AzureAD/microsoft-identity-web@4.10.0...4.11.0). </details> Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
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Problem
The E2E test
AcquireTokenWithMtlsPop_WithBindingCertificate_ReturnsMtlsPopToken(tests/E2E Tests/TokenAcquirerTests/TokenAcquirer.cs) is failing on the PR pipeline with:Investigation
Reproduced and root-caused while debugging the same failure in MSAL.NET (AzureAD/microsoft-authentication-library-for-dotnet#6084):
westus3.mtlsauth.microsoft.com(test slice — used by this test)Bearermtlsauth.microsoft.com(global — used by a sibling MSAL.NET test)MSAL is correctly routing to the regional mtlsauth endpoint, sending
token_type=mtls_pop, and presenting the SNI cert. The AAD westus3 test slice is silently downgrading the response. This is not a Microsoft.Identity.Web or MSAL regression.Fix
Skip the test via
[Fact(Skip = ""..."")]— the repo's established pattern for known-broken external-dependency tests (see e.g.WebAppIntegrationTests.cs,TokenAcquirer.cs:268,CertificateRotationTest.cs:45). Remove the skip when AAD test slice is fixed.Tracking