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Fix Docker Compose Environment Variable Substitution Failed - Cloudflare 521 Error: Authenticated Origin Pulls Setup-How to Restore Missing System Tray Icons on Windows

2026-07-28 15:48:00
Fix Docker Compose Environment Variable Substitution Failed - Cloudflare 521 Error: Authenticated Origin Pulls Setup-How to Restore Missing System Tray Icons on Windows

Result check

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

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