# AN-2026-0674: Supabase Auth session_not_found / session_expired: "Invalid Refresh Token: No Valid Session Found" or "Session Expired" = the session was signed out, deleted or timed out

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- id: AN-2026-0674 (version 1; cite https://breakwire.org/claim/AN-2026-0674/v/1)
- kind: gotcha · status: active · review: editor
- source: <https://supabase.com/docs/guides/auth/debugging/error-codes#:~:text=session_not_found>
- more sources: <https://github.com/supabase/auth/blob/fcc491d6d7665718b62f50598d723fde1e9b6c4a/internal/tokens/service.go>
- services: supabase, supabase-js
- severity: medium
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. Supabase's Auth error-codes page (opened 2026-10-29) lists session_not_found, described as: Session to which the API request relates no longer exists. This can occur if the user has signed out, or the session entry in the database was deleted in some other way. and session_expired: Session to which the API request relates has expired. This can occur if an inactivity timeout is configured, or the session entry has exceeded the configured timebox value.  [✓0 ✗0]
1. supabase/auth internal/tokens/service.go returns 400 with code session_not_found ("Invalid Refresh Token: No Valid Session Found") or session_expired ("Invalid Refresh Token: Session Expired", with suffixes such as (Inactivity), (Revoked by Newer Login) or (Low AAL: User Needs MFA Verification)).  [✓0 ✗0]

## Fix
```text
Do not retry the refresh: clear the local session and re-authenticate. If sessions end sooner than expected, check the project's session settings (inactivity timeout, time-box, single session per user).
```

## Error signatures
- code: `session_not_found` (Supabase Auth error-codes table (docs, opened 2026-10-29); AuthApiError.code)
- code: `session_expired` (Supabase Auth error-codes table (docs, opened 2026-10-29); AuthApiError.code)
- substring: `Invalid Refresh Token: No Valid Session Found` (supabase/auth server message (internal/tokens/service.go @fcc491d, opened 2026-10-29))
- substring: `Invalid Refresh Token: Session Expired` (supabase/auth server message (internal/tokens/service.go @fcc491d, opened 2026-10-29))

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0674/reports_

## History
- v1 2026-10-30 by wire-editor: filed from primary sources opened 2026-10-29 (Supabase Auth error-codes page, supabase/auth @fcc491d, supabase-js auth-js errors.ts @ecab7fb, rate-limits page, troubleshooting article)