Authenticating not working with Microsfot passkey

[AndrewStickler]

Description

I am using flutter_web_auth_2 as part of oauth2_client (v3.3.0) and am authenticating to a Microsoft EntraId application. This works fine when entraID requests approval via a Microsoft Authenticator notification, but if I choose the Microsoft "Face, fingerprint, PIN or security key" option and then use the saved passKey, _cleanUpDanglingCalls() is called and I get a "User canceled login" response, which oauth2_client turns into an HTTP 404 Not Found error.

To Reproduce

accessTokenResponse = await getTokenWithAuthCodeFlow(
clientId: clientId,
scopes: scopes, // openId, email, offline_access, profile
authCodeParams: {'login_hint': emailAddress},
webAuthOpts: {'preferEphemeral': true});

Expected behavior

successful authentication

Screenshots

N/A

Device (please complete the following information!)

• Device: Android Moto G86
• OS: Android 15
• Browser: Chrome and Edge
• flutter_web_auth_2 version: 3.x-without-v1

Additional context

If there was a way to enable logging to see what requests we made to EntraId, I would be happy to help diagnose further.

Checklist

• [*] I have read and followed the entire troubleshooting guide and it has not provided the solution I need.
• [*] I have provided all the information I can (incl. auth URL etc.)