diff --git a/app/config.py b/app/config.py
index c40cdf4c..34baee34 100644
--- a/app/config.py
+++ b/app/config.py
@@ -4,7 +4,7 @@ import socket
 import string
 import subprocess
 from ast import literal_eval
-from typing import Callable
+from typing import Callable, List
 from urllib.parse import urlparse
 
 from dotenv import load_dotenv
@@ -419,4 +419,13 @@ ZENDESK_HOST = os.environ.get("ZENDESK_HOST")
 ZENDESK_API_TOKEN = os.environ.get("ZENDESK_API_TOKEN")
 ZENDESK_ENABLED = "ZENDESK_ENABLED" in os.environ
 
-ALLOWED_REDIRECT_DOMAINS = sl_getenv("ALLOWED_REDIRECT_DOMAINS", list) or []
+
+def get_allowed_redirect_domains() -> List[str]:
+    allowed_domains = sl_getenv("ALLOWED_REDIRECT_DOMAINS", list)
+    if allowed_domains:
+        return allowed_domains
+    parsed_url = urlparse(URL)
+    return [parsed_url.hostname]
+
+
+ALLOWED_REDIRECT_DOMAINS = get_allowed_redirect_domains()