HTTP ERROR 500, returnUrl null, redict failed.

[TuonggVi]

The situation is that on the same server, when accessing the login endpoint via the desktop app, it is possible to receive the token, while the mobile app encounters a 500 error due to a null returnUrl, leading to a failed redirect.
final AuthorizationTokenResponse? result =
await _appAuth.authorizeAndExchangeCode(
AuthorizationTokenRequest(
clientId,
redirectUri,
serviceConfiguration: AuthorizationServiceConfiguration(
tokenEndpoint:
'https://authenticationserver2023.azurewebsites.net/connect/token',
authorizationEndpoint:
'https://authenticationserver2023.azurewebsites.net/connect/authorize'
),
scopes: scopes,
issuer: 'https://authenticationserver2023.azurewebsites.net',
),
);
Config mobile app:

manifestPlaceholders += [
'appAuthRedirectScheme': 'native-client'

  <intent-filter android:autoVerify="true">
    <action android:name="android.intent.action.VIEW" />
    <category android:name="android.intent.category.DEFAULT" />
    <category android:name="android.intent.category.BROWSABLE" />
    <!-- Accepts URIs that begin with https://YOUR_HOST -->
    <data
      android:scheme="native-client"
      android:host="authenticationserver2023.azurewebsites.net" />
  </intent-filter>

Do I need to use a query in my code or not?
Please help me

[MaikuB]

An issue like this is something you would have to investigate on your end as it's all configuration-specific and specific to your situation. It wouldn't a plugin issue so you need to ensure you understand how OAuth works (includes understanding redirect URLs) and how your identity provider/auth server works in case it's not compliant with how OAuth is implemented and requires extra details.

Closing as it's not something you have to look into further