Flutter SDK - Session expired or invalid

const session = require('express-session');
const DynamoDBStore = require('connect-dynamodb')(session);
const { setupKinde, GrantType } = require('@kinde-oss/kinde-node-express');
...
const app = express();
...
store = new DynamoDBStore({
  table: process.env.SESSIONS_DYNAMODB_TABLE_NAME,
  client: dynamoDbUtils.dynamoClient,
});

app.use(session({
  store,
  secret: process.env.SESSION_SECRET,
  saveUninitialized: false,
  cookie: {
    sameSite: 'lax',  // Allow cookies in top-level navigations
    httpOnly: true,  // If true, session cookie is not accessible by JavaScript (for security)
    secure: process.env.ENVIRONMENT === 'production',  // Set to true only in production (HTTPS)
    path: '/',
  },
  resave: false,
}));
...
if (!kindeClient) {
  kindeClient = setupKinde(kindeConfig, app);
}
...

await KindeFlutterSDK.initializeSDK(
  authDomain: dotenv.env['KINDE_AUTH_DOMAIN']!,
  authClientId: dotenv.env['KINDE_AUTH_CLIENT_ID']!,
  loginRedirectUri: dotenv.env['KINDE_LOGIN_REDIRECT_URI']!,
  logoutRedirectUri: dotenv.env['KINDE_LOGOUT_REDIRECT_URI']!,
  scopes: dotenv.env['KINDE_SCOPES']!.split(" "),
);

try {
  final startTime = DateTime.now();
  final String? token = await KindeFlutterSDK.instance.getToken();
  final duration = DateTime.now().difference(startTime).inMilliseconds;
  return token;
} catch (e) {
  return null;
}