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When someone has more than one account on a workspace, they have duplicate accounts. Duplicate accounts typically occur by mistake on workspaces that require members to use single sign-on (SSO). For example, if a member enters an email alias to sign in to Slack, or enters a typo, this will create a new account. If this happens, Workspace Owners or Org Owners can fix duplicate accounts for members.
Note: On the free plan, duplicate accounts will need to be resolved by the impacted member. Members can fix the duplicate account by following the steps to change your email address on both accounts.
Next, find the original account and replace the email address with the one you released.
Click Manage in the top-right corner, then select Send SSO Rebind Email. The member will receive an email instructing them how to bind and authenticate their account.
Prevent duplicate accounts
To prevent duplicate accounts from being created, ensure that everyone uses the correct email address that is tied to their account. Here are some tips to keep in mind:
Make sure members use the correct email address to sign in to Slack. If a member's email address is email@example.com, but they use the alias firstname.lastname@example.org instead, they'll end up with a duplicate account.
If you're using an identity provider (IDP), make sure your identifier is set to a unique and unchanging value, like an employee number, for example. Setting your identifier to a value like an email address may result in members creating duplicate accounts.