diff --git a/packages/core/src/lib/register.ts b/packages/core/src/lib/register.ts
index b02073ced..96707715c 100644
--- a/packages/core/src/lib/register.ts
+++ b/packages/core/src/lib/register.ts
@@ -39,7 +39,7 @@ const saveUserInfoToSession = async (
     {
       socialUserInfo,
     },
-    { mergeWithLastSubmission: false }
+    { mergeWithLastSubmission: true }
   );
   ctx.body = { redirectTo };
 };
diff --git a/packages/core/src/lib/social.ts b/packages/core/src/lib/social.ts
index d6151c2f0..ebeec8974 100644
--- a/packages/core/src/lib/social.ts
+++ b/packages/core/src/lib/social.ts
@@ -50,7 +50,7 @@ export const getUserInfoFromInteractionResult = async (
     })
     .parse(interactionResult);
 
-  assertThat(result.socialUserInfo.connectorId === connectorId, 'session.insufficient_info');
+  assertThat(result.socialUserInfo.connectorId === connectorId, 'session.connector_id_mismatch');
 
   return result.socialUserInfo.userInfo;
 };