Is it possible to use the same username across multiple Salesforce Orgs?

Salesforce usernames dance to different domain beats: each login domain has its own tune, so duplicates might sneak in… but not everywhere. Sandbox, Production, and Experience Site hold surprises!

Category Explanation
Primary Login Domains Unique username required across login.salesforce.com, test.salesforce.com, and any other unique domains.
My Domain Does not create a unique login domain; usernames still need to be unique in the primary login domain.
Multiple Domains (e.g., Production & Sandbox) Username can be the same in Production and a Sandbox org.
Multiple Sandboxes Username must be unique across different sandboxes.
Experience Site Users Certain Experience Site users can share the same username across different organizations.
Developer & Production Username must be unique across a Developer org and Production org.

Primary Login Domains

In Salesforce, usernames are unique across what we call "Primary Login Domains." These are the main Salesforce login URLs, such as:

  • login.salesforce.com – Used for accessing most production (live) Salesforce environments.
  • test.salesforce.com – Dedicated to sandbox environments, which are test environments separate from live data.

Because each of these domains operates independently, a single username (like firstname.lastname@company.com) can be used both on login.salesforce.com for a production environment and on test.salesforce.com for a sandbox environment. This means you can create an account with the same username in both environments without conflicts.

However, within each specific environment type (e.g., multiple sandboxes), usernames still need to be unique. For instance, if you try to use firstname.lastname@company.com in multiple sandbox environments under test.salesforce.com, Salesforce will not allow it, and you’ll need to add a unique variation, like firstname.lastname.sandbox1@company.com.

This setup allows users to access different environments (Production and Sandbox) with the same username, helping them easily switch between testing and live systems, while keeping each environment’s data and access separate.

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