Hi,
I'm on a Hobby team (sangamesh-gellas-projects). Project sift-app (prj_ZNj5dtpctWgUDQzdHfJ7QYmslj0F) returns the platform 404 DEPLOYMENT_NOT_FOUND after Vercel Authentication, even though the production deployment is READY and the dashboard shows the project as running (not paused).
Production deployment:
- ID: dpl_56M67YA8HRQvJtDreU4h71EBqjPK
- Unique URL: https://sift-e2l0sf3nq-sangamesh-gellas-projects.vercel.app
- Inspector: https://vercel.com/sangamesh-gellas-projects/sift-app/56M67YA8HRQvJtDreU4h71EBqjPK
- State: READY, target production, region iad1
- Commit: c601ee6dd8adbae116e0b494aabfaac8ae1b5e51 on github.com/divingsbysangam/sift-app (main)
- Aliases assigned with no aliasError: sift-app-sangamesh-gellas-projects.vercel.app, sift-app-beryl.vercel.app, sift-app-git-main-sangamesh-gellas-projects.vercel.app
What happens:
- Unauthenticated requests to those vercel.app hosts 302 to Vercel SSO, as expected (SSO protection is all_except_custom_domains).
- After I sign in, the same hosts return 404 DEPLOYMENT_NOT_FOUND. This includes the unique deployment URL, the production aliases, and an older preview alias. It is not limited to one hostname or one region.
- The project API still reports live: false, and the unpause API returns null without changing updatedAt, even though the dashboard shows the project running.
- There is no request trace for these 404s (trace lookup returns not found), which suggests the request never reaches the app.
Request IDs:
- bom1:bom1::lbgzg-1794424064019-476cc0c7ce77 — https://sift-app-sangamesh-gellas-projects.vercel.app/ (iPhone Safari, Mumbai)
- bom1:bom1::vtthl-1794424244026-260ad2883a38 — https://sift-e2l0sf3nq-sangamesh-gellas-projects.vercel.app/ (iPhone Safari, Mumbai)
- iad1:iad1:iad1::s26zw-1794424300223-aa49778fc4f4 — same unique deployment URL, authenticated, from iad1
- iad1:iad1:iad1::q6bcc-179442435