[Bug] [M] WithTenant ignored, resulting in CA failures for multi-tenant apps

[bgavrilMS]

MSAL 4.29 with WAM on UWP

Repro

var options = new PublicClientApplicationOptions();
             options.ClientId = token.ClientId;                            // “110797d6-4a5e-4e58-a06d-f1bf3f3a8069”

            var app = PublicClientApplicationBuilder
                .CreateWithApplicationOptions(options)
                .WithTenantId(token.TenantId)                             //The tenantId passed here (“3cfc49f9-956e-4e4e-a1b6-e03368c2e448”)
                .WithAuthority(token.AuthorityEndpoint)          //Set to the “common” endpoint “https://login.microsoftonline.com/common”
                .WithExperimentalFeatures(true)
               .WithBroker(true)
              
               .Build();

Expected: AcquireToken* should work for user
Actual: AcquireToken* fails because the authority passed to WAM ends in "common", instead of the tenanted one, causing issues with Conditional Access

Workaround

Use a tenanted authority instead, i.e. https://login.microsoftonline.com/3cfc49f9-956e-4e4e-a1b6-e03368c2e448

[bgavrilMS]

This needs to be checked with both a browser and with WAM. Original bug was reported via WAM. Can repro on all tfms.