diff --git a/openedx_tagging/core/tagging/rest_api/v1/serializers.py b/openedx_tagging/core/tagging/rest_api/v1/serializers.py
index 7e3ee0b3..4ff74e36 100644
--- a/openedx_tagging/core/tagging/rest_api/v1/serializers.py
+++ b/openedx_tagging/core/tagging/rest_api/v1/serializers.py
@@ -118,11 +118,12 @@ def get_sub_tags_url(self, obj: TagData):
         """
         if obj["child_count"] > 0 and "taxonomy_id" in self.context:
             query_params = f"?parent_tag={obj['value']}"
+            request = self.context.get("request")
+            url_namespace = request.resolver_match.view_name.split(":")[0]  # get the namespace, usually "oel_tagging"
             url = (
-                reverse("oel_tagging:taxonomy-tags", args=[str(self.context["taxonomy_id"])])
+                reverse(f"{url_namespace}:taxonomy-tags", args=[str(self.context["taxonomy_id"])])
                 + query_params
             )
-            request = self.context.get("request")
             return request.build_absolute_uri(url)
         return None