Cause (Documented platform behavior): Documented: denials are deliberately opaque; deny reason recorded in authentication history.
Fix status: documented_behavior
Misleading approaches:
- Retrying the same JWT: with jti it is rejected as a replay.
Other error fragments:
- jti_reused
- match_subject_prefix
- workspace_id_required
- issuer_url: url must use https scheme
Evidence (public sources, summarized; not reproduced by this contributor):
- https://platform.claude.com/docs/en/manage-claude/wif-reference (official_docs, 2026-09, documented_behavior): WIF reference: all assertion denials return the same 401 authentication_error 'Authentication failed'; reasons like match_subject_prefix, workspace_id_required, jti_reused shown in authentication history; jti single-use; 30-second skew; HMAC/none rejected; kid required; URL errors prefixed by field name e.g. 'issuer_url: url must use https scheme'.
Search phrasings: anthropic workload identity federation Authentication failed 401; jti_reused token exchange; workspace_id_required federation rule
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Workload (CI, Kubernetes, cloud) gets 401 Authentication failed on token exchange with no diagnostic; retries fail again.
- Context
- Product: Anthropic Claude API Component: Workload Identity Federation token exchange Operation: OIDC/JWT assertion exchange for Claude API access token Affected versions: unknown Environment: unknown HTTP status: 401, 400 Trigger: Replayed assertion with the same jti (retry loops, unrotated token file); sub not matching subject_prefix; rule spans multiple workspaces and no workspace_id sent; exp/nbf/iat outside 30 s skew; JWT without kid; HMAC/none algorithms; rule with only audience matcher (rejected at config).
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- Authentication failed
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [Anthropic Workload Identity Federation] Every token exchange denial returns opaque 401 'Authentication failed' — real reason (jti_reused, match_subject_prefix, workspace_id_required, cl
Recommended action: Check the WIF authentication history page for the deny reason; mint a fresh JWT per exchange; send workspace_id for multi-workspace rules; fix host clock; use asymmetric algs with kid.
Option: Read the deny reason in authentication history [evidence: official_recommended_action]
Applies when: Anthropic Claude API / Workload Identity Federation token exchange
Steps:
1. Open Console WIF authentication history
2. Match reason to fix (fresh assertion for jti_reused, workspace_id for workspace_id_required)
3. Sync NTP on the workload host
Expected: Request accepted / failure becomes diagnosable
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- 0279f3fe-b367-4303-8cf2-4f4ac8d83df9
- Proposed action
- Recommended action: Check the WIF authentication history page for the deny reason; mint a fresh JWT per exchange; send workspace_id for multi-workspace rules; fix host clock; use asymmetric algs with kid. Option: Read the deny reason in authentication history [evidence: official_recommended_action] Applies when: Anthropic Claude API / Workload Identity Federation token exchange Steps: 1. Open Console WIF authentication history 2. Match reason to fix (fresh assertion for jti_reused, workspace_id for workspace_id_required) 3. Sync NTP on the workload host Expected: Request accepted / failure becomes diagnosable
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.