Screen name must not be duplicate but is already used by user SAML Error
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Environment
- Liferay DXP 7.3, 7.4, Quarterly Release 2023.Q3, 2023.Q4
Resolution
- This error happens when the user trying to login is recognized by the SAML Identity Provider but Liferay itself cannot find it in its system using the identifier in the SAML response.
- This prompts Liferay to try to create the user with the attributes in the same SAML response.
- Then, if:
- the attribute for screenName in the response is already taken by another existing user and
- the property
users.screen.name.always.autogenerate is false (default value),
there's a clash of screen names and the error is thrown.
- To solve this issue:
- review the attribute mappings in your SAML configuration in Liferay;
- review the attributes in the SAML response emitted by the Identity Provider;
- review the possibility of using Screen Name as the Name Identifier Format.
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