[Bug] WAM broker does not honor LoginHint

[JPWilli]

MSAL 4.46

1. Use WAM preview
2. Declare that the app is MSA-PT, i.e. only AAD plugin should handle auth
3. AcquireTokenInteractive using a login_hint

Actual: the full account picker pops up every time

Expected - a better interactive login experience, at the very least the Account Picker should not be invoked and instead the AAD plugin's browser should accelerate the authentication, e.g. Note that if account is part of the OS, the AAD plugin seems to be able to give back token silently.

Tracking ADO issue: https://identitydivision.visualstudio.com/Engineering/_workitems/edit/2040431

Note: when implementing a fix, please see #3520 as well for internal API details

[bgavrilMS]

This is a known issue, and something that should be discussed with WAM team. If you know in advance that the user if AAD or MSA, there may be an enhancement that can be done.

[JPWilli]

At least in our use case, we could provide IsMSA or IsAAD metadata with the login hint if needed.

[bgavrilMS]

@bgavrilMS - need to test this with msal_runtime and with wam separately.

[bgavrilMS]

Closing this. For new requests to WAM, please contact them directly.

[bgavrilMS]

CC @crmann1 - I updated this bug to track the re-auth issue.