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"User Already Exists" Error When New User Clicks Invitation Link on Anypoint Platform

Publish Date: May 6, 2026
Description
When an administrator sends a new user invitation via the blue "Send Invite" button in Anypoint Platform, or through a newly provisioned MuleSoft account first invite, the invitation is dispatched successfully. However, when the new user clicks the link in the invitation email and attempts to complete account registration, they encounter the error:
"User already exists"
This occurs because Anypoint Platform usernames must be globally unique across all customers organizations. If the email address or username being registered is already associated with an existing Anypoint Platform user in any organization, the system blocks the creation of a duplicate identity even if the user does not appear to exist within the specific organization sending the invite.
Resolution
  1. Have the new user attempt registration with a unique username that is not already registered on the Anypoint Platform. Note: usernames do not need to match the email address.
  2. If the email address itself is the source of conflict, the user may need to use a different/unique username during the sign-up form (usernames are separate from email addresses in Anypoint Platform).
  3. Once a unique username is used, the user can complete the registration and gain access successfully.
Knowledge Article Number

005321720

 
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Salesforce Help | Article