Vercel MCP OAuth fails from Cursor cloud-agents dashboard: "The app redirect URL is invalid" Attempting to authenticate the Vercel MCP (https://mcp.vercel.com) for Cursor cloud agents from cursor.com/dashboard/integrations fails on Vercel's authorize page with "App configuration error — The app redirect URL is invalid", before the callback returns to Cursor. Authorize URL shows client_id=cl_eD921KDq5R4BhfW5pRKJ6KHgY7d0JycM, code_challenge_method=S256. Reproduced 2026-07-20 in a fresh incognito session, two different accounts, and after removing/re-adding the MCP server. Cloud agents/automations use the https://www.cursor.com/agents/mcp/oauth/callback redirect — please confirm it's registered on the Vercel OAuth client used by the MCP integration (same class of issue as forum thread 159005 and the Linear case in 158845, where the fix was provider-side registration of Cursor's callback).
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