Tesvm For reference, the failing command was: codex mcp add vercel --url mcp.vercel.com The OAuth flow then generated a callback like: 127.0.0.1:49683/callback/J69OfRTZqnV5 Vercel rejected it before returning to Codex. That usually removes one back-and-forth.
luchao Has this been resolved? What would be the solution?
dan-lee Running into the same issue. With corepack enabled, I'd have expected Vercel to pick up the pinned pnpm version automatically.
Holmlab Developer Setting ENABLE_EXPERIMENTAL_COREPACK=1 env var in Vercel UI worked for me.
dan-lee Edit: Ok weird, in another project it seems to work just fine 🤨 Edit 2: Found the issue: It's a monorepo that had a sub-package that defined a pnpm@10 version. The error message picked up the root package.json hence my confusion. Are you sure? This is what I see:
Amy Egan If you can tell me more about the problem, I’d be happy to connect with the engineering team to get you the help you need or share your feedback!
Erik Sandquist Well I had a problem where AI gateway selects another provider than the BYOK option, but it doesn't disclose a reason for it. The status is ok for the provider, tried testing the key again and it worked and have balance at the provider but still chooses another provider which massively drained my Vercel balance since without BYOK i get charged about 5-6x more.
Quest Same here, hopefully upvoting/commenting will get this attention
Taras Having the same issue here, persisting after redeploy. Happening only in one of my projects for some reason
0x00b7 This is due to their new firewall enforcement, which also blocks their own preview server from taking screenshots.