diff --git a/django3_saml2_nbplugin/backends.py b/django3_saml2_nbplugin/backends.py
index de0eed8..364b11d 100644
--- a/django3_saml2_nbplugin/backends.py
+++ b/django3_saml2_nbplugin/backends.py
@@ -171,8 +171,10 @@ def configure_user(self, request: WSGIRequest, user: User) -> User:
             pass
 
         if "FLAGS_BY_GROUP" in be_settings and "GROUP_ATTR" in be_settings:
-            for flag, group_name in be_settings["FLAGS_BY_GROUP"].items():
-                if group_name in ident_groups:
+            for flag, group_names in be_settings["FLAGS_BY_GROUP"].items():
+                if not isinstance(group_names, list):
+                    group_names = [group_names]
+                if any(group_name in ident_groups for group_name in group_names):
                     setattr(user, flag, True)
                 else:
                     setattr(user, flag, False)