diff --git a/native/identity-service/identity-service-context-provider.react.js b/native/identity-service/identity-service-context-provider.react.js
--- a/native/identity-service/identity-service-context-provider.react.js
+++ b/native/identity-service/identity-service-context-provider.react.js
@@ -666,7 +666,7 @@
           token,
           userIDs,
         );
-        const identities = JSON.parse(result);
+        const { identities } = JSON.parse(result);
         return assertWithValidator(identities, identitiesValidator);
       },
       versionSupported: () => {
diff --git a/native/native_rust_library/src/identity/find_user_identities.rs b/native/native_rust_library/src/identity/find_user_identities.rs
--- a/native/native_rust_library/src/identity/find_user_identities.rs
+++ b/native/native_rust_library/src/identity/find_user_identities.rs
@@ -34,8 +34,10 @@
 }
 
 #[derive(Serialize)]
+#[serde(rename_all = "camelCase")]
 pub struct UserIdentities {
   pub identities: HashMap<String, Identity>,
+  pub reserved_user_identifiers: HashMap<String, String>,
 }
 
 #[derive(Serialize)]
@@ -81,7 +83,10 @@
       })
       .collect();
 
-    Ok(UserIdentities { identities })
+    Ok(UserIdentities {
+      identities,
+      reserved_user_identifiers: response.reserved_user_identifiers,
+    })
   }
 }
 
@@ -105,5 +110,5 @@
 
   let user_identities = UserIdentities::try_from(response)?;
 
-  Ok(serde_json::to_string(&user_identities.identities)?)
+  Ok(serde_json::to_string(&user_identities)?)
 }