Vercel deployment fails with internal error during deploying outputs phase

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I’m getting a persistent “We encountered an internal error. Please try again.” error during the “Deploying outputs…” phase. The build completes successfully every time, but deployment fails.

Details

  • Project: Next.js 16.1.6 (Turbopack)
  • First fail: 3 hours ago
  • Regions tried: pdx1 (Portland), lhr1 (London) - same error in both

Build log (truncated)

Build Completed in /vercel/output [47s]

Deploying outputs…

Error: We encountered an internal error. Please try again.

What I’ve tried

  1. Redeploying multiple times
  2. Switching from bun to npm
  3. Changing deployment region to lhr1
  4. Triggering redeployment of previously working builds

The build phase succeeds consistently - static pages generate, serverless functions are created, static files are collected. The error only occurs during “Deploying outputs” which seems to be Vercel infrastructure, not my code.

Is there something in my build output that could trigger this? Or is this a known infrastructure issue? Please note that if I trigger redeployment of previously working builds, they fail with the same error message.

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