AADSTS error code changes: new, removed and reworded Entra codes
Microsoft adds, removes and rewords AADSTS error codes in its Entra authentication and authorization error code reference without a changelog. This page is that changelog: a snapshot of the reference every week, compared with the previous one, with the exact text before and after each change.
Subscribe with the RSS feed of AADSTS changes (one item per change).
What is tracked
Section titled “What is tracked”- Source: the markdown file behind Microsoft’s reference page, reference-error-codes.md in the MicrosoftDocs/entra-docs repository. It holds the same table as the Learn page, without layout noise, and every version has a commit ID, so each snapshot can be reproduced.
- What is compared: every row of the “AADSTS error codes” table, as code, name (the identifier before the dash, such as
UserAccountNotFound) and description. Whitespace is normalized so re-wrapped lines do not count as changes. A code Microsoft lists twice (such as 50147) is kept as one entry with both rows. - Change types: new code, removed code, name changed, description changed.
- How often: every Tuesday. A new snapshot is stored only when something changed, so an unchanged week adds nothing here.
- Safety check: a run that parses fewer than 200 codes, or that would remove or rewrite most of the table, stops without writing anything. A change in Microsoft’s page layout therefore cannot show up as a fake “everything removed”.
- Not tracked: the live error lookup and the messages Entra actually returns at sign-in. Those can differ from the reference. For a code with its own page here, see the “Microsoft’s description” quote on that page.
- Baseline: , 350 codes. The baseline run records no change events; it is what later weeks are compared with.
- Latest snapshot: , 350 codes, from MicrosoftDocs/entra-docs@a4be4ac (file last changed 2026-06-15).
- Snapshots stored: 1. Change events recorded: 0.
Changes, newest first
Section titled “Changes, newest first”Each change shows Microsoft’s text before and after. The before and after text is the record. Codes with a page on this site link to it.
No changes recorded yet. Microsoft's list has not changed since the baseline of 2026-10-25, or the next weekly run has not happened yet.
Data and reuse
Section titled “Data and reuse”Every change event is also available as JSON at /aadsts-changes.json: date, code, change type, the text before and after, and the summary where there is one, plus the baseline and latest snapshot dates and the source commit. Reuse the change list freely with a link to this page as the source. The before and after text is Microsoft’s: © Microsoft Corporation, from the MicrosoftDocs/entra-docs repository, used under its MIT License. Keep that notice when you reuse the text.
For the codes this site explains in depth, see the AADSTS code map and how pages are written and checked.