diff --git a/workspaces/netlify-cms-auth/src/callback.ts b/workspaces/netlify-cms-auth/src/callback.ts
index ae3964983e..8d52ba6b13 100644
--- a/workspaces/netlify-cms-auth/src/callback.ts
+++ b/workspaces/netlify-cms-auth/src/callback.ts
@@ -65,7 +65,8 @@ function postMessageHTML({ status, data, env }: PostMessageHTMLArgs) {
         const allowedOrigin = (
           message.origin === 'http://localhost:1234' ||
           message.origin === 'http://127.0.0.1:1234' ||
-          /^https:\\/\\/[-_\\w]+\\.starknet-netlify-cms\\.pages\\.dev$/.test(message.origin) || 
+          /^https:\\/\\/[-_\\w]+\\.starknet-netlify-cms\\.pages\\.dev$/.test(message.origin) ||
+          /^https:\\/\\/[-_\\w]+\\.starknet-netlify-cms-byd\\.pages\\.dev$/.test(message.origin) ||
           message.origin === '${env.CMS_URL}'
         );