[Bug] MSAL sends x-ms-pkeyauth header on Mac and Linux

[bgavrilMS]

Library version used

4.58

.NET version

NET 7

Scenario

PublicClient - desktop app, ConfidentialClient - web site (AcquireTokenByAuthCode), ConfidentialClient - web api (AcquireTokenOnBehalfOf), ConfidentialClient - service to service (AcquireTokenForClient)

Is this a new or an existing app?

None

Issue description and reproduction steps

On Mac OS, sometimes it errors out as ESTS thinks MSAL is capable of sedning PKeyAuth proof.

Relevant code snippets

Bug is here:

https://github.com/AzureAD/microsoft-authentication-library-for-dotnet/blob/main/src/client/Microsoft.Identity.Client/OAuth2/TokenClient.cs#L187

The logic is wrong, as it returns: !IsWin10OrServerEquivalent i.e. IsWindows() && IsWin10Plus()

But on Mac this evaluates to TRUE, since IsWindows returns false.

Expected behavior

No response

Identity provider

Microsoft Entra ID (Work and School accounts and Personal Microsoft accounts)

Regression

No response

Solution and workarounds

No response