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Salesforce Error 'Duplicate Username' When a User is Created or Edited After a Sandbox Refresh

Fecha de publicación: Jul 5, 2026
Descripción

When Users try to edit or save User records in a sandbox right after the refresh completes, they might encounter an error:


Error: Duplicate Username. The username already exists in this or another Salesforce organization. Usernames must be unique across all Salesforce organizations. To resolve, use a different username (it doesn't need to match the user's email address).

This error occurs specifically in sandbox environments immediately after a refresh because usernames must be unique across all Salesforce organizations, including sandboxes. The timing of the error is related to how user data is replicated between org instances.

Solución

There are 2 reasons why this might happen :


1. Previous Sandbox Not Properly Deleted - Usernames are unique across all production or sandbox instances. If the previous sandbox did not delete properly, it will retain the username and cause a conflict in the new sandbox.
2. Username Replication Delays - This can happen when a newly refreshed org and old org are on different instances, as it takes a while for the user info to be replicated in the new org.


In both these cases, the issue will resolve itself after a while. If the issue persists after 24 hours, please log a case with Support.

Número del artículo de conocimiento

000383623

 
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Salesforce Help | Article