Error Code Portal
MicrosoftMicrosoft Entra IDError code

AADSTS50101

Unknown claims transformer '{name}' was specified for principal '{principalId}'.

Alternative forms: 50101

What does this code mean?

Code AADSTS50101 · An issue reported by Microsoft Entra ID.

Official explanation · Original text

Unknown claims transformer '{name}' was specified for principal '{principalId}'.

Troubleshooting and diagnostic links

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

Source and terms of use

Microsoft Entra authentication and authorization error codes ↗

Creator: Microsoft Corporation and contributors
License: Creative Commons Attribution 4.0 International
Checked on: 2026-11-12

Modifications: Extracted official AADSTS table; Markdown stripped; short English error name selected; original Korean product context added. Official general diagnostic guide is distinguished from code-specific troubleshooting. Documentation license explicitly granted by README Legal Notices; repository LICENSE currently contains MIT terms, also retained as evidence.

Source details · Original licenses and notices