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Docker Compose Environment Variable Not Working: Fixes - How to Fix Cloudflare 521 Error (Port 443 Blocked)-Troubleshooting TypeScript Errors in npm run build

2026-07-28 15:28:16
Docker Compose Environment Variable Not Working: Fixes - How to Fix Cloudflare 521 Error (Port 443 Blocked)-Troubleshooting TypeScript Errors in npm run build

Result check

  • Keep one change per test run so you know which step helped.
  • Undo temporary changes after the issue is confirmed.