WAM with UI requires password auth to be used

[jformacek]

Library version used

4.66.0

.NET version

.NET8

Scenario

PublicClient - desktop app

Is this a new or an existing app?

None

Issue description and reproduction steps

Hello, I wanted to ask for guidance with WAM and FIDO/passwordless:

• basically using the way as described in example here (just without cache): https://learn.microsoft.com/en-us/dotnet/api/microsoft.identity.client.publicclientapplication?view=msal-dotnet-latest
• when using with WAM and different account than my own Windows account (account from different tenant), I get MsalUIRequiredException, call AcquireTokenInteractive() and get UI with built-in webWiev
• UI gets displayed, offering various methods of authentication:
  
• however only password-based auth works. When selecting 'Use your face, fingerprint, PIN, or security key instead' option, then error occurs:
  
• even after entering the password, conditional access requires MFA, and again, option 'Face, fingerprint, PIN, or security key' does not work, producing the same error - at least I can use Azure Authenticator to verify my account
  

Getting the same behavior when logging in to Windows App to get access to my W365 desktop in different tenant - so I believe this is not just problem with my code.

I'm wondering what is and is not supported with WAM and passwordless when UI gets required for authentication. FIDO itself works fine for me with other authentication flows (e.g. Interactive login via Edge browser).

Relevant code snippets

No response

Expected behavior

'Face, fingerprint, PIN, or security key' option works when WAM shows an UI

Identity provider

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

Regression

No response

Solution and workarounds

Authenticate with password and provide 2nd factor by other MFA method than FIDO

[jformacek]

Closing as it fixed itself after few reboots - problems most likely caused by some local issue