inviteUserByEmail consistently 504ing — auth admin invite endpoint unresponsive

I'm trying to invite users via supabase.auth.admin.inviteUserByEmail() but it consistently hangs and returns a 504.

Environment

• Framework: Next.js 15 (App Router)
• Platform: Web
• Library: ├─┬ @supabase/ssr@0.9.0 │ └── @supabase/supabase-js@2.100.1 deduped └── @supabase/supabase-js@2.100.1
• OS: Mac

What I'm trying to do Call inviteUserByEmail() from a Next.js server action using the service role client to invite new staff users.

What's going wrong The request hangs for ~30 seconds then throws:

AuthRetryableFetchError: {}
__isAuthError: true, status: 504, code: undefined

What I've ruled out

• admin.auth.admin.createUser() works instantly on the same project with the same service role client
• The dashboard invite (Authentication → Users → Invite user) also hangs and fails
• Project status shows healthy, no active incidents
• Pausing and resuming the project made no difference
• Environment variables are correct — other Supabase calls work fine

Seems like the invite endpoint specifically is broken on my project while everything else functions normally. Any idea what could cause this?

Tags: bug, auth, server-side