diff --git a/backend/open_webui/utils/oauth.py b/backend/open_webui/utils/oauth.py
index 0b4a1d55e0..ddf9af6294 100644
--- a/backend/open_webui/utils/oauth.py
+++ b/backend/open_webui/utils/oauth.py
@@ -266,11 +266,11 @@ async def get_authorization_server_discovery_urls(server_url: str) -> list[str]:
             ) as response:
                 if response.status == 401:
                     match = re.search(
-                        r'resource_metadata="([^"]+)"',
+                        r'resource_metadata=(?:"([^"]+)"|([^\s,]+))',
                         response.headers.get('WWW-Authenticate', ''),
                     )
                     if match:
-                        resource_metadata_url = match.group(1)
+                        resource_metadata_url = match.group(1) or match.group(2)
                         log.debug(f'Found resource_metadata URL: {resource_metadata_url}')
 
                         # Step 2: Fetch Protected Resource metadata