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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This was referenced Jun 24, 2026
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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