Update app.py

app.py

@@ -11,7 +11,7 @@ app.secret_key = b'_5#y2L"F4Q8z\n\xec]/' # Change this key for secure deployment
 csrf = CSRFProtect(app)
 app.config['WTF_CSRF_CHECK_DEFAULT'] = False
 app.config['SESSION_COOKIE_SECURE'] = True
-app.config['SESSION_COOKIE_SAMESITE'] = 'None'
+app.server.config['SESSION_COOKIE_SAMESITE'] = 'None'
 
 SESSION_DICT = {}