Site name: monumental-horse-8c648d
Custom domain: ukworkrights.co.uk
Since 24 June 2026, any fresh zip deploy breaks all serverless function API calls with 400 POST errors on /api/proxy. Rolling back to the June 24 12:23 PM deploy via the dashboard instantly restores functionality.
I have now proven this is a platform-side issue: I re-uploaded the exact same zip that works on rollback — it broke immediately on fresh deploy. Code is identical. All environment variables confirmed present.
The function exists in both cases but returns 400 on fresh deploys. No build log available as I use manual zip deploys. Site has been stuck on June 24 deploy for 5 days. Open support ticket has had no response.