diff --git a/openlibrary/accounts/model.py b/openlibrary/accounts/model.py
index 0318b46d810..b0623444c74 100644
--- a/openlibrary/accounts/model.py
+++ b/openlibrary/accounts/model.py
@@ -689,7 +689,9 @@ def create(
                 return ia_account
 
             elif 'screenname' not in response.get('values', {}):
-                raise OLAuthenticationError('undefined_error')
+                error = OLAuthenticationError('undefined_error')
+                error.response = response
+                raise error
 
             elif attempt >= retries:
                 e = OLAuthenticationError('username_registered')
diff --git a/openlibrary/plugins/upstream/account.py b/openlibrary/plugins/upstream/account.py
index be8772ba57a..17c89418e31 100644
--- a/openlibrary/plugins/upstream/account.py
+++ b/openlibrary/plugins/upstream/account.py
@@ -328,7 +328,8 @@ def POST(self):
                 from openlibrary.plugins.openlibrary.sentry import sentry
 
                 if sentry.enabled:
-                    sentry.capture_exception(e)
+                    extra = {'response': e.response} if hasattr(e, 'response') else None
+                    sentry.capture_exception(e, extras=extra)
 
         return render['account/create'](f)
 
diff --git a/openlibrary/utils/sentry.py b/openlibrary/utils/sentry.py
index 438da403ab1..0b549fae0b9 100644
--- a/openlibrary/utils/sentry.py
+++ b/openlibrary/utils/sentry.py
@@ -87,8 +87,11 @@ def capture_exception_webpy(self):
             scope.add_event_processor(add_web_ctx_to_event)
             sentry_sdk.capture_exception()
 
-    def capture_exception(self, ex):
+    def capture_exception(self, ex, extras: dict | None = None):
         with sentry_sdk.push_scope() as scope:
+            if extras:
+                for key, value in extras.items():
+                    scope.set_extra(key, value)
             scope.add_event_processor(add_web_ctx_to_event)
             sentry_sdk.capture_exception(ex)