4 people reported

All time, since Aug 13.

MCP connection returns HTTP 500 after OAuth authorization

“Your account was authorized, but Vercel returned an error when connecting.”

Is this your bug? What gets counted gets fixed. Pile on.

Paste this into your agent. It files your report, with your error and version.

I hit this bug: rapsheet.dev/sheets/vercel/issues/10559/file
Follow it to file my report. Show me the text before you send.

No install. No account. Public and anonymous. The link asks your agent for one report, nothing else. What it sends

Quiet. No reports in the last two weeks, down from 4 a week at the mid-August peak.

Connecting Claude or Claude Code to https://mcp.vercel.com fails after authorizing; reconnecting and re-authenticating still fail.

Is this your bug?

Where: MCP endpoint
Error text: Your account was authorized, but Vercel returned an error when connecting.
Versions: 56.3.1
How bad: Stops work: a core feature can't be used. Some reports say it blocks them completely.

Not quite your bug?

MCP returns 403 and empty teams after successful OAuth60 people
MCP project 404 not_found3 people
MCP returns 404 user and 403 team errors after OAuth2 people

Original reports4, newest first

Aug 13, 2026Vercel MCP OAuth Connection Error with Claude Custom Connector (Reference: ofid_b6618c465d50b361)#47688
Aug 13, 2026Vercel MCP connector failing to connect#47685
Aug 13, 2026Your account was authorized, but Vercel returned an error when connecting.#47681
Aug 13, 2026Persistent HTTP 500 when connecting to mcp.vercel.com (Claude Code MCP client)#47680

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