Error Code Portal
GoogleFirebase Authentication Admin SDKError code

auth/reserved-claims

reserved claims

What does this code mean?

Code auth/reserved-claims · An issue reported by Firebase Authentication Admin SDK.

Official explanation · Original text

One or more custom user claims provided to setCustomUserClaims() are reserved. For example, OIDC specific claims such as (sub, iat, iss, exp, aud, auth_time, etc.) should not be used as keys for custom claims.

Troubleshooting and diagnostic links

First check that the document's product, version, and environment match your situation.

Source and terms of use

Firebase Admin Authentication API Errors ↗

Creator: Google LLC
License: Creative Commons Attribution 4.0 International
Checked on: 2026-11-12

Modifications: Extracted official error code and description/resolution table; HTML stripped; short code name and original Korean context added. No source-page analytics scripts are redistributed in rendered pages.

Source details · Original licenses and notices