OpenID authentication does not supports username containing capital letters - 6.4

Talend Data Fabric Release Notes

Talend Data Fabric
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Symptoms: OpenID authentication only supports usernames in lower case. If the username contains capital letters, Talend STS (Security Token Service) will throw an exception that the user is not found.

Workaround: If you want to use OpenID authentication, the username must be all in lower case.