# March 12, 2026 - Enhanced SSO user name validation

**URL:** <https://community.cumulocity.com/t/march-12-2026-enhanced-sso-user-name-validation/14337>\
**Category:** Platform services\
**Tags:** Api-change, platform-services, rest-api\
**Created:** [March 13, 2026, 7:20am UTC](https://community.cumulocity.com/t/march-12-2026-enhanced-sso-user-name-validation/14337 "2026-03-13T07:20:09Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![cumulocity](https://dub1.discourse-cdn.com/flex005/user_avatar/community.cumulocity.com/cumulocity/32/31990_2.png) [@cumulocity](https://community.cumulocity.com/u/cumulocity)\
**Post date:** [March 13, 2026, 7:20am UTC](https://community.cumulocity.com/t/march-12-2026-enhanced-sso-user-name-validation/14337/1 "2026-03-13T07:20:09Z")

</div>

## Context

* * *

**Change Type:** API change  
**Product area:** Platform services  
**Component:** REST API  
**Deployed at:** [eu.latest.cumulocity.com](http://eu.latest.cumulocity.com), [apj.cumulocity.com](http://apj.cumulocity.com), [jp.cumulocity.com](http://jp.cumulocity.com), [cumulocity.com](http://cumulocity.com), [us.cumulocity.com](http://us.cumulocity.com)

> **Technical details**
>
> **Build artifact:** cumulocity (2026.69.0)  
> **Internal ID:** MTM-66224

## Description

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Validation has been added for the **“User/App ID – Constant value”** field used during SSO authentication when the **“Use constant value”** option is enabled.

When a constant username is configured for SSO users (optional setting), it now follows the same validation rules as a standard username:

## Validation Rules

- **String length:** 1–1000 characters
- **Must not contain:**
  - Whitespace
  - Slashes
  - Any of the following characters: `+`, `$`, `:`

This change ensures consistency in username validation and prevents invalid values from being configured for shared SSO accounts.